25402391 has 8 divisors (see below), whose sum is σ = 29523840. Its totient is φ = 21404088.

The previous prime is 25402367. The next prime is 25402417. The reversal of 25402391 is 19320452.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25402391 - 2²² = 21208087 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25402391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25402591) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30341 + ... + 31166.

It is an arithmetic number, because the mean of its divisors is an integer number (3690480).

Almost surely, 2^25402391 is an apocalyptic number.

25402391 is a deficient number, since it is larger than the sum of its proper divisors (4121449).

25402391 is an equidigital number, since it uses as much as digits as its factorization.

25402391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61573.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 25402391 is about 5040.0784716113. The cubic root of 25402391 is about 293.9622292477.

The spelling of 25402391 in words is "twenty-five million, four hundred two thousand, three hundred ninety-one".