25239257 has 4 divisors (see below), whose sum is σ = 26336640. Its totient is φ = 24141876.

The previous prime is 25239233. The next prime is 25239281. The reversal of 25239257 is 75293252.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (25239233) and next prime (25239281).

It is a cyclic number.

It is not a de Polignac number, because 25239257 - 2⁸ = 25239001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25239287) 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, 548657 + ... + 548702.

It is an arithmetic number, because the mean of its divisors is an integer number (6584160).

Almost surely, 2^25239257 is an apocalyptic number.

It is an amenable number.

25239257 is a deficient number, since it is larger than the sum of its proper divisors (1097383).

25239257 is a wasteful number, since it uses less digits than its factorization.

25239257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1097382.

The product of its digits is 37800, while the sum is 35.

The square root of 25239257 is about 5023.8687283805. The cubic root of 25239257 is about 293.3316028077.

The spelling of 25239257 in words is "twenty-five million, two hundred thirty-nine thousand, two hundred fifty-seven".