25640925 has 12 divisors (see below), whose sum is σ = 42393120. Its totient is φ = 13675120.

The previous prime is 25640921. The next prime is 25640933. The reversal of 25640925 is 52904652.

It is not a de Polignac number, because 25640925 - 2² = 25640921 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25640921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 170865 + ... + 171014.

It is an arithmetic number, because the mean of its divisors is an integer number (3532760).

Almost surely, 2^25640925 is an apocalyptic number.

25640925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25640925 is a deficient number, since it is larger than the sum of its proper divisors (16752195).

25640925 is a wasteful number, since it uses less digits than its factorization.

25640925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341892 (or 341887 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 25640925 is about 5063.6868979035. The cubic root of 25640925 is about 294.8794873068.

It can be divided in two parts, 25640 and 925, that added together give a triangular number (26565 = T₂₃₀).

The spelling of 25640925 in words is "twenty-five million, six hundred forty thousand, nine hundred twenty-five".