18663925 has 24 divisors (see below), whose sum is σ = 27605376. Its totient is φ = 12239040.

The previous prime is 18663919. The next prime is 18663929. The reversal of 18663925 is 52936681.

It is not a de Polignac number, because 18663925 - 2³ = 18663917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18663929) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1707 + ... + 6343.

It is an arithmetic number, because the mean of its divisors is an integer number (1150224).

Almost surely, 2^18663925 is an apocalyptic number.

It is an amenable number.

18663925 is a deficient number, since it is larger than the sum of its proper divisors (8941451).

18663925 is a wasteful number, since it uses less digits than its factorization.

18663925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4677 (or 4672 counting only the distinct ones).

The product of its digits is 77760, while the sum is 40.

The square root of 18663925 is about 4320.1765010240. The cubic root of 18663925 is about 265.2574926899.

The spelling of 18663925 in words is "eighteen million, six hundred sixty-three thousand, nine hundred twenty-five".