18425172 has 24 divisors (see below), whose sum is σ = 43698592. Its totient is φ = 6040800.

The previous prime is 18425159. The next prime is 18425177. The reversal of 18425172 is 27152481.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18425177) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11854 + ... + 13317.

Almost surely, 2^18425172 is an apocalyptic number.

18425172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18425172 is an abundant number, since it is smaller than the sum of its proper divisors (25273420).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18425172 is a wasteful number, since it uses less digits than its factorization.

18425172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25239 (or 25237 counting only the distinct ones).

The product of its digits is 4480, while the sum is 30.

The square root of 18425172 is about 4292.4552414673. The cubic root of 18425172 is about 264.1215578864.

The spelling of 18425172 in words is "eighteen million, four hundred twenty-five thousand, one hundred seventy-two".