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2500000 = 2557
BaseRepresentation
bin1001100010010110100000
311201000100121
421202112200
51120000000
6125330024
730151426
oct11422640
94630317
102500000
111458318
12a06914
13696bb9
14491116
15345b1a
hex2625a0

2500000 has 48 divisors (see below), whose sum is σ = 6152328. Its totient is φ = 1000000.

The previous prime is 2499997. The next prime is 2500009. The reversal of 2500000 is 52.

Multipling 2500000 by its product of nonzero digits (10), we get a square (25000000 = 50002).

2500000 divided by its product of nonzero digits (10) gives a square (250000 = 5002).

Adding to 2500000 its reverse (52), we get a palindrome (2500052).

It can be divided in two parts, 2 and 500000, that multiplied together give a 6-th power (1000000 = 106).

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 4 ways, for example, as 1507984 + 992016 = 1228^2 + 996^2 .

It is a sliding number, since 2500000 = 500000 + 2000000 and 1/500000 + 1/2000000 = 0.000002500000.

It is a hoax number, since the sum of its digits (7) coincides with the sum of the digits of its distinct prime factors.

It is an Ulam number.

It is an enlightened number because it begins with the concatenation of its prime factors (25).

It is not an unprimeable number, because it can be changed into a prime (2500009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 499998 + ... + 500002.

22500000 is an apocalyptic number.

2500000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2500000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3076164).

2500000 is an abundant number, since it is smaller than the sum of its proper divisors (3652328).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2500000 is an frugal number, since it uses more digits than its factorization.

2500000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45 (or 7 counting only the distinct ones).

The product of its (nonzero) digits is 10, while the sum is 7.

The square root of 2500000 is about 1581.1388300842. The cubic root of 2500000 is about 135.7208808297.

The spelling of 2500000 in words is "two million, five hundred thousand".

Divisors: 1 2 4 5 8 10 16 20 25 32 40 50 80 100 125 160 200 250 400 500 625 800 1000 1250 2000 2500 3125 4000 5000 6250 10000 12500 15625 20000 25000 31250 50000 62500 78125 100000 125000 156250 250000 312500 500000 625000 1250000 2500000