25402987 has 4 divisors (see below), whose sum is σ = 25425576. Its totient is φ = 25380400.

The previous prime is 25402973. The next prime is 25402997. The reversal of 25402987 is 78920452.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25402987 - 2⁷ = 25402859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25402967) 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, 9514 + ... + 11887.

It is an arithmetic number, because the mean of its divisors is an integer number (6356394).

Almost surely, 2^25402987 is an apocalyptic number.

25402987 is a deficient number, since it is larger than the sum of its proper divisors (22589).

25402987 is a wasteful number, since it uses less digits than its factorization.

25402987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22588.

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 25402987 is about 5040.1375973281. The cubic root of 25402987 is about 293.9645282455.

The spelling of 25402987 in words is "twenty-five million, four hundred two thousand, nine hundred eighty-seven".