18993872 has 10 divisors (see below), whose sum is σ = 36800658. Its totient is φ = 9496928.

The previous prime is 18993853. The next prime is 18993881. The reversal of 18993872 is 27839981.

It can be written as a sum of positive squares in only one way, i.e., 13868176 + 5125696 = 3724^2 + 2264^2 .

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, 593543 + ... + 593574.

Almost surely, 2^18993872 is an apocalyptic number.

It is an amenable number.

18993872 is a deficient number, since it is larger than the sum of its proper divisors (17806786).

18993872 is a wasteful number, since it uses less digits than its factorization.

18993872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1187125 (or 1187119 counting only the distinct ones).

The product of its digits is 217728, while the sum is 47.

The square root of 18993872 is about 4358.1959570446. The cubic root of 18993872 is about 266.8114741290.

The spelling of 18993872 in words is "eighteen million, nine hundred ninety-three thousand, eight hundred seventy-two".