25604939 has 2 divisors, whose sum is σ = 25604940. Its totient is φ = 25604938.

The previous prime is 25604899. The next prime is 25604959. The reversal of 25604939 is 93940652.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25604939 is a prime.

It is a super-2 number, since 2×25604939² = 1311225802387442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25604959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12802469 + 12802470.

It is an arithmetic number, because the mean of its divisors is an integer number (12802470).

Almost surely, 2^25604939 is an apocalyptic number.

25604939 is a deficient number, since it is larger than the sum of its proper divisors (1).

25604939 is an equidigital number, since it uses as much as digits as its factorization.

25604939 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 58320, while the sum is 38.

The square root of 25604939 is about 5060.1323105231. The cubic root of 25604939 is about 294.7414722470.

The spelling of 25604939 in words is "twenty-five million, six hundred four thousand, nine hundred thirty-nine".