18986768 has 10 divisors (see below), whose sum is σ = 36786894. Its totient is φ = 9493376.

The previous prime is 18986767. The next prime is 18986771. The reversal of 18986768 is 86768981.

It can be written as a sum of positive squares in only one way, i.e., 18421264 + 565504 = 4292^2 + 752^2 .

It is not an unprimeable number, because it can be changed into a prime (18986767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 593321 + ... + 593352.

Almost surely, 2^18986768 is an apocalyptic number.

It is an amenable number.

18986768 is a deficient number, since it is larger than the sum of its proper divisors (17800126).

18986768 is a wasteful number, since it uses less digits than its factorization.

18986768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1186681 (or 1186675 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 53.

The square root of 18986768 is about 4357.3808646938. The cubic root of 18986768 is about 266.7782061173.

The spelling of 18986768 in words is "eighteen million, nine hundred eighty-six thousand, seven hundred sixty-eight".