18918725 has 12 divisors (see below), whose sum is σ = 26810784. Its totient is φ = 12972720.

The previous prime is 18918709. The next prime is 18918727. The reversal of 18918725 is 52781981.

It is not a de Polignac number, because 18918725 - 2⁴ = 18918709 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18918727) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 53879 + ... + 54228.

It is an arithmetic number, because the mean of its divisors is an integer number (2234232).

Almost surely, 2^18918725 is an apocalyptic number.

It is an amenable number.

18918725 is a deficient number, since it is larger than the sum of its proper divisors (7892059).

18918725 is a wasteful number, since it uses less digits than its factorization.

18918725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108124 (or 108119 counting only the distinct ones).

The product of its digits is 40320, while the sum is 41.

The square root of 18918725 is about 4349.5660703109. The cubic root of 18918725 is about 266.4591397544.

The spelling of 18918725 in words is "eighteen million, nine hundred eighteen thousand, seven hundred twenty-five".