18867994 has 16 divisors (see below), whose sum is σ = 30155328. Its totient is φ = 8823232.

The previous prime is 18867973. The next prime is 18868001. The reversal of 18867994 is 49976881.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4017 + ... + 7339.

It is an arithmetic number, because the mean of its divisors is an integer number (1884708).

Almost surely, 2^18867994 is an apocalyptic number.

18867994 is a deficient number, since it is larger than the sum of its proper divisors (11287334).

18867994 is a wasteful number, since it uses less digits than its factorization.

18867994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3509.

The product of its digits is 870912, while the sum is 52.

The square root of 18867994 is about 4343.7304244163. The cubic root of 18867994 is about 266.2207544269.

The spelling of 18867994 in words is "eighteen million, eight hundred sixty-seven thousand, nine hundred ninety-four".