18318925 has 12 divisors (see below), whose sum is σ = 23703840. Its totient is φ = 14017520.

The previous prime is 18318913. The next prime is 18318941. The reversal of 18318925 is 52981381.

It is not a de Polignac number, because 18318925 - 2⁵ = 18318893 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, 15355 + ... + 16504.

It is an arithmetic number, because the mean of its divisors is an integer number (1975320).

Almost surely, 2^18318925 is an apocalyptic number.

It is an amenable number.

18318925 is a deficient number, since it is larger than the sum of its proper divisors (5384915).

18318925 is a wasteful number, since it uses less digits than its factorization.

18318925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31892 (or 31887 counting only the distinct ones).

The product of its digits is 17280, while the sum is 37.

The square root of 18318925 is about 4280.0613313363. The cubic root of 18318925 is about 263.6129016522.

The spelling of 18318925 in words is "eighteen million, three hundred eighteen thousand, nine hundred twenty-five".