18618172 has 6 divisors (see below), whose sum is σ = 32581808. Its totient is φ = 9309084.

The previous prime is 18618169. The next prime is 18618191. The reversal of 18618172 is 27181681.

It is a super-6 number, since 6×18618172⁶ (a number of 45 digits) contains 666666 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2327268 + ... + 2327275.

Almost surely, 2^18618172 is an apocalyptic number.

It is an amenable number.

18618172 is a deficient number, since it is larger than the sum of its proper divisors (13963636).

18618172 is a wasteful number, since it uses less digits than its factorization.

18618172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4654547 (or 4654545 counting only the distinct ones).

The product of its digits is 5376, while the sum is 34.

The square root of 18618172 is about 4314.8779820523. The cubic root of 18618172 is about 265.0405633884.

The spelling of 18618172 in words is "eighteen million, six hundred eighteen thousand, one hundred seventy-two".