18618572 has 12 divisors (see below), whose sum is σ = 37237200. Its totient is φ = 7979376.

The previous prime is 18618557. The next prime is 18618583. The reversal of 18618572 is 27581681.

18618572 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 332447 + ... + 332502.

It is an arithmetic number, because the mean of its divisors is an integer number (3103100).

Almost surely, 2^18618572 is an apocalyptic number.

It is an amenable number.

18618572 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

18618572 is a wasteful number, since it uses less digits than its factorization.

18618572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664960 (or 664958 counting only the distinct ones).

The product of its digits is 26880, while the sum is 38.

The square root of 18618572 is about 4314.9243330561. The cubic root of 18618572 is about 265.0424614528.

The spelling of 18618572 in words is "eighteen million, six hundred eighteen thousand, five hundred seventy-two".