18977796 has 18 divisors (see below), whose sum is σ = 47971742. Its totient is φ = 6325920.

The previous prime is 18977773. The next prime is 18977813. The reversal of 18977796 is 69777981.

It can be written as a sum of positive squares in only one way, i.e., 11492100 + 7485696 = 3390^2 + 2736^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 263545 + ... + 263616.

Almost surely, 2^18977796 is an apocalyptic number.

It is an amenable number.

18977796 is an abundant number, since it is smaller than the sum of its proper divisors (28993946).

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

18977796 is a wasteful number, since it uses less digits than its factorization.

18977796 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 527171 (or 527166 counting only the distinct ones).

The product of its digits is 1333584, while the sum is 54.

The square root of 18977796 is about 4356.3512255097. The cubic root of 18977796 is about 266.7361784066.

The spelling of 18977796 in words is "eighteen million, nine hundred seventy-seven thousand, seven hundred ninety-six".