18913768 has 8 divisors (see below), whose sum is σ = 35463330. Its totient is φ = 9456880.

The previous prime is 18913747. The next prime is 18913781. The reversal of 18913768 is 86731981.

It can be written as a sum of positive squares in only one way, i.e., 14152644 + 4761124 = 3762^2 + 2182^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1182103 + ... + 1182118.

Almost surely, 2^18913768 is an apocalyptic number.

It is an amenable number.

18913768 is a deficient number, since it is larger than the sum of its proper divisors (16549562).

18913768 is a wasteful number, since it uses less digits than its factorization.

18913768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2364227 (or 2364223 counting only the distinct ones).

The product of its digits is 72576, while the sum is 43.

The square root of 18913768 is about 4348.9962060227. The cubic root of 18913768 is about 266.4358655761.

The spelling of 18913768 in words is "eighteen million, nine hundred thirteen thousand, seven hundred sixty-eight".