18685625 has 20 divisors (see below), whose sum is σ = 26691456. Its totient is φ = 12810000.

The previous prime is 18685621. The next prime is 18685651. The reversal of 18685625 is 52658681.

It is not a de Polignac number, because 18685625 - 2² = 18685621 is a prime.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18685621) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2240 + ... + 6510.

Almost surely, 2^18685625 is an apocalyptic number.

It is an amenable number.

18685625 is a deficient number, since it is larger than the sum of its proper divisors (8005831).

18685625 is an frugal number, since it uses more digits than its factorization.

18685625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4298 (or 4283 counting only the distinct ones).

The product of its digits is 115200, while the sum is 41.

The square root of 18685625 is about 4322.6872429081. The cubic root of 18685625 is about 265.3602552514.

The spelling of 18685625 in words is "eighteen million, six hundred eighty-five thousand, six hundred twenty-five".