18977992 has 16 divisors (see below), whose sum is σ = 38818800. Its totient is φ = 8626320.

The previous prime is 18977963. The next prime is 18978019. The reversal of 18977992 is 29977981.

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, 107742 + ... + 107917.

It is an arithmetic number, because the mean of its divisors is an integer number (2426175).

Almost surely, 2^18977992 is an apocalyptic number.

It is an amenable number.

18977992 is an abundant number, since it is smaller than the sum of its proper divisors (19840808).

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

18977992 is a wasteful number, since it uses less digits than its factorization.

18977992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215676 (or 215672 counting only the distinct ones).

The product of its digits is 571536, while the sum is 52.

The square root of 18977992 is about 4356.3737213421. The cubic root of 18977992 is about 266.7370966747.

It can be divided in two parts, 1897 and 7992, that added together give a palindrome (9889).

The spelling of 18977992 in words is "eighteen million, nine hundred seventy-seven thousand, nine hundred ninety-two".