18766994 has 4 divisors (see below), whose sum is σ = 28150494. Its totient is φ = 9383496.

The previous prime is 18766987. The next prime is 18767009. The reversal of 18766994 is 49966781.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49966781 = 47 ⋅1063123.

It can be written as a sum of positive squares in only one way, i.e., 18361225 + 405769 = 4285^2 + 637^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4691747 + ... + 4691750.

Almost surely, 2^18766994 is an apocalyptic number.

18766994 is a deficient number, since it is larger than the sum of its proper divisors (9383500).

18766994 is an equidigital number, since it uses as much as digits as its factorization.

18766994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9383499.

The product of its digits is 653184, while the sum is 50.

The square root of 18766994 is about 4332.0888725879. The cubic root of 18766994 is about 265.7448794806.

The spelling of 18766994 in words is "eighteen million, seven hundred sixty-six thousand, nine hundred ninety-four".