18934812 has 36 divisors (see below), whose sum is σ = 51546040. Its totient is φ = 5825952.

The previous prime is 18934807. The next prime is 18934829. The reversal of 18934812 is 21843981.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19762 + ... + 20697.

Almost surely, 2^18934812 is an apocalyptic number.

18934812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18934812 is an abundant number, since it is smaller than the sum of its proper divisors (32611228).

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

18934812 is a wasteful number, since it uses less digits than its factorization.

18934812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40482 (or 40477 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 18934812 is about 4351.4149422918. The cubic root of 18934812 is about 266.5346436758.

The spelling of 18934812 in words is "eighteen million, nine hundred thirty-four thousand, eight hundred twelve".