18923994 has 12 divisors (see below), whose sum is σ = 41002026. Its totient is φ = 6307992.

The previous prime is 18923987. The next prime is 18924011. The reversal of 18923994 is 49932981.

It can be written as a sum of positive squares in only one way, i.e., 18792225 + 131769 = 4335^2 + 363^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 525649 + ... + 525684.

Almost surely, 2^18923994 is an apocalyptic number.

18923994 is an abundant number, since it is smaller than the sum of its proper divisors (22078032).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18923994 is a wasteful number, since it uses less digits than its factorization.

18923994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1051341 (or 1051338 counting only the distinct ones).

The product of its digits is 139968, while the sum is 45.

The square root of 18923994 is about 4350.1717207485. The cubic root of 18923994 is about 266.4838743826.

It can be divided in two parts, 1892 and 3994, that added together give a triangular number (5886 = T₁₀₈).

The spelling of 18923994 in words is "eighteen million, nine hundred twenty-three thousand, nine hundred ninety-four".