18990964 has 6 divisors (see below), whose sum is σ = 33234194. Its totient is φ = 9495480.

The previous prime is 18990943. The next prime is 18990973. The reversal of 18990964 is 46909981.

It can be written as a sum of positive squares in only one way, i.e., 18748900 + 242064 = 4330^2 + 492^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2373867 + ... + 2373874.

Almost surely, 2^18990964 is an apocalyptic number.

It is an amenable number.

18990964 is a deficient number, since it is larger than the sum of its proper divisors (14243230).

18990964 is a wasteful number, since it uses less digits than its factorization.

18990964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4747745 (or 4747743 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 46.

The square root of 18990964 is about 4357.8623199913. The cubic root of 18990964 is about 266.7978569763.

The spelling of 18990964 in words is "eighteen million, nine hundred ninety thousand, nine hundred sixty-four".