18040988 has 24 divisors (see below), whose sum is σ = 36765792. Its totient is φ = 7585344.

The previous prime is 18040973. The next prime is 18041033. The reversal of 18040988 is 88904081.

It is a super-2 number, since 2×18040988² = 650954496032288, which contains 22 as substring.

It is a plaindrome in base 16.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4595 + ... + 7562.

It is an arithmetic number, because the mean of its divisors is an integer number (1531908).

Almost surely, 2^18040988 is an apocalyptic number.

It is an amenable number.

18040988 is an abundant number, since it is smaller than the sum of its proper divisors (18724804).

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

18040988 is a wasteful number, since it uses less digits than its factorization.

18040988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12221 (or 12219 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 38.

The square root of 18040988 is about 4247.4684224842. The cubic root of 18040988 is about 262.2729125992.

The spelling of 18040988 in words is "eighteen million, forty thousand, nine hundred eighty-eight".