18981488 has 20 divisors (see below), whose sum is σ = 37244640. Its totient is φ = 9369984.

The previous prime is 18981451. The next prime is 18981493. The reversal of 18981488 is 88418981.

It is a congruent 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, 6245 + ... + 8772.

It is an arithmetic number, because the mean of its divisors is an integer number (1862232).

Almost surely, 2^18981488 is an apocalyptic number.

It is an amenable number.

18981488 is a deficient number, since it is larger than the sum of its proper divisors (18263152).

18981488 is a wasteful number, since it uses less digits than its factorization.

18981488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15104 (or 15098 counting only the distinct ones).

The product of its digits is 147456, while the sum is 47.

The square root of 18981488 is about 4356.7749540228. The cubic root of 18981488 is about 266.7534745162.

The spelling of 18981488 in words is "eighteen million, nine hundred eighty-one thousand, four hundred eighty-eight".