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25040 = 245313
BaseRepresentation
bin110000111010000
31021100102
412013100
51300130
6311532
7133001
oct60720
937312
1025040
11178a4
12125a8
13b522
1491a8
157645
hex61d0

25040 has 20 divisors (see below), whose sum is σ = 58404. Its totient is φ = 9984.

The previous prime is 25037. The next prime is 25057. The reversal of 25040 is 4052.

It can be written as a sum of positive squares in 2 ways, for example, as 3136 + 21904 = 56^2 + 148^2 .

It is a sliding number, since 25040 = 40 + 25000 and 1/40 + 1/25000 = 0.025040.

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

It is a nialpdrome in base 13.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77 + ... + 236.

225040 is an apocalyptic number.

25040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25040 is an abundant number, since it is smaller than the sum of its proper divisors (33364).

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

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29202).

25040 is a wasteful number, since it uses less digits than its factorization.

25040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326 (or 320 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 11.

The square root of 25040 is about 158.2403235588. The cubic root of 25040 is about 29.2557638336.

25040 divided by its product of nonzero digits (40) gives a palindrome (626).

Adding to 25040 its reverse (4052), we get a palindrome (29092).

It can be divided in two parts, 250 and 40, that multiplied together give a 4-th power (10000 = 104).

The spelling of 25040 in words is "twenty-five thousand, forty".

Divisors: 1 2 4 5 8 10 16 20 40 80 313 626 1252 1565 2504 3130 5008 6260 12520 25040