18418172 has 18 divisors (see below), whose sum is σ = 33023088. Its totient is φ = 8984352.

The previous prime is 18418159. The next prime is 18418177. The reversal of 18418172 is 27181481.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18418177) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 58688 + ... + 59000.

It is an arithmetic number, because the mean of its divisors is an integer number (1834616).

Almost surely, 2^18418172 is an apocalyptic number.

It is an amenable number.

18418172 is a deficient number, since it is larger than the sum of its proper divisors (14604916).

18418172 is an equidigital number, since it uses as much as digits as its factorization.

18418172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 677 (or 362 counting only the distinct ones).

The product of its digits is 3584, while the sum is 32.

The square root of 18418172 is about 4291.6397798511. The cubic root of 18418172 is about 264.0881057321.

The spelling of 18418172 in words is "eighteen million, four hundred eighteen thousand, one hundred seventy-two".