25398987 has 8 divisors (see below), whose sum is σ = 34093200. Its totient is φ = 16818720.

The previous prime is 25398979. The next prime is 25399019. The reversal of 25398987 is 78989352.

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

It is not a de Polignac number, because 25398987 - 2³ = 25398979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25398907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27964 + ... + 28857.

It is an arithmetic number, because the mean of its divisors is an integer number (4261650).

Almost surely, 2^25398987 is an apocalyptic number.

25398987 is a deficient number, since it is larger than the sum of its proper divisors (8694213).

25398987 is a wasteful number, since it uses less digits than its factorization.

25398987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56973.

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

The square root of 25398987 is about 5039.7407671427. The cubic root of 25398987 is about 293.9490980412.

The spelling of 25398987 in words is "twenty-five million, three hundred ninety-eight thousand, nine hundred eighty-seven".