25399287 has 6 divisors (see below), whose sum is σ = 36687872. Its totient is φ = 16932852.

The previous prime is 25399267. The next prime is 25399307. The reversal of 25399287 is 78299352.

It is an interprime number because it is at equal distance from previous prime (25399267) and next prime (25399307).

It is not a de Polignac number, because 25399287 - 2²⁴ = 8622071 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25399237) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1411063 + ... + 1411080.

Almost surely, 2^25399287 is an apocalyptic number.

25399287 is a deficient number, since it is larger than the sum of its proper divisors (11288585).

25399287 is a wasteful number, since it uses less digits than its factorization.

25399287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2822149 (or 2822146 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The square root of 25399287 is about 5039.7705304905. The cubic root of 25399287 is about 293.9502553627.

The spelling of 25399287 in words is "twenty-five million, three hundred ninety-nine thousand, two hundred eighty-seven".