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2145040 = 24526813
BaseRepresentation
bin1000001011101100010000
311000222102221
420023230100
51022120130
6113550424
724142522
oct10135420
94028387
102145040
111235667
12875414
135a1471
143dba12
152c587a
hex20bb10

2145040 has 20 divisors (see below), whose sum is σ = 4987404. Its totient is φ = 857984.

The previous prime is 2145023. The next prime is 2145047. The reversal of 2145040 is 405412.

It can be written as a sum of positive squares in 2 ways, for example, as 1192464 + 952576 = 1092^2 + 976^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a plaindrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (2145047) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13327 + ... + 13486.

22145040 is an apocalyptic number.

2145040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2145040 is an abundant number, since it is smaller than the sum of its proper divisors (2842364).

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

2145040 is a wasteful number, since it uses less digits than its factorization.

2145040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26826 (or 26820 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 2145040 is about 1464.5955072989. The cubic root of 2145040 is about 128.9669606712.

The spelling of 2145040 in words is "two million, one hundred forty-five thousand, forty".

Divisors: 1 2 4 5 8 10 16 20 40 80 26813 53626 107252 134065 214504 268130 429008 536260 1072520 2145040