18494988 has 48 divisors (see below), whose sum is σ = 44854656. Its totient is φ = 5927040.

The previous prime is 18494981. The next prime is 18495007. The reversal of 18494988 is 88949481.

It is a super-2 number, since 2×18494988² = 684129162240288, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18494988.

It is not an unprimeable number, because it can be changed into a prime (18494981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37423 + ... + 37913.

It is an arithmetic number, because the mean of its divisors is an integer number (934472).

Almost surely, 2^18494988 is an apocalyptic number.

It is an amenable number.

18494988 is an abundant number, since it is smaller than the sum of its proper divisors (26359668).

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

18494988 is a wasteful number, since it uses less digits than its factorization.

18494988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 614 (or 612 counting only the distinct ones).

The product of its digits is 663552, while the sum is 51.

The square root of 18494988 is about 4300.5799608890. The cubic root of 18494988 is about 264.4547373899.

The spelling of 18494988 in words is "eighteen million, four hundred ninety-four thousand, nine hundred eighty-eight".