18387725 has 12 divisors (see below), whose sum is σ = 24001440. Its totient is φ = 13935600.

The previous prime is 18387701. The next prime is 18387739. The reversal of 18387725 is 52778381.

It is not a de Polignac number, because 18387725 - 2⁸ = 18387469 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18881 + ... + 19830.

It is an arithmetic number, because the mean of its divisors is an integer number (2000120).

Almost surely, 2^18387725 is an apocalyptic number.

It is an amenable number.

18387725 is a deficient number, since it is larger than the sum of its proper divisors (5613715).

18387725 is a wasteful number, since it uses less digits than its factorization.

18387725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38740 (or 38735 counting only the distinct ones).

The product of its digits is 94080, while the sum is 41.

The square root of 18387725 is about 4288.0910671300. The cubic root of 18387725 is about 263.9425045055.

The spelling of 18387725 in words is "eighteen million, three hundred eighty-seven thousand, seven hundred twenty-five".