25399887 has 16 divisors (see below), whose sum is σ = 36126720. Its totient is φ = 15818112.

The previous prime is 25399883. The next prime is 25399939. The reversal of 25399887 is 78899352.

It is not a de Polignac number, because 25399887 - 2² = 25399883 is a prime.

It is a super-2 number, since 2×25399887² = 1290308519225538, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25399883) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5298 + ... + 8880.

It is an arithmetic number, because the mean of its divisors is an integer number (2257920).

Almost surely, 2^25399887 is an apocalyptic number.

25399887 is a deficient number, since it is larger than the sum of its proper divisors (10726833).

25399887 is a wasteful number, since it uses less digits than its factorization.

25399887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3742.

The product of its digits is 1088640, while the sum is 51.

The square root of 25399887 is about 5039.8300566587. The cubic root of 25399887 is about 293.9525699784.

The spelling of 25399887 in words is "twenty-five million, three hundred ninety-nine thousand, eight hundred eighty-seven".