25239905 has 16 divisors (see below), whose sum is σ = 31285440. Its totient is φ = 19538112.

The previous prime is 25239881. The next prime is 25239937. The reversal of 25239905 is 50993252.

It is a cyclic number.

It is not a de Polignac number, because 25239905 - 2⁸ = 25239649 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19127 + ... + 20403.

It is an arithmetic number, because the mean of its divisors is an integer number (1955340).

Almost surely, 2^25239905 is an apocalyptic number.

It is an amenable number.

25239905 is a deficient number, since it is larger than the sum of its proper divisors (6045535).

25239905 is a wasteful number, since it uses less digits than its factorization.

25239905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1408.

The product of its (nonzero) digits is 24300, while the sum is 35.

The square root of 25239905 is about 5023.9332200976. The cubic root of 25239905 is about 293.3341131465.

The spelling of 25239905 in words is "twenty-five million, two hundred thirty-nine thousand, nine hundred five".