18973812 has 48 divisors (see below), whose sum is σ = 52016832. Its totient is φ = 5306880.

The previous prime is 18973807. The next prime is 18973831. The reversal of 18973812 is 21837981.

It is a super-2 number, since 2×18973812² = 720011083622688, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3813 + ... + 7244.

It is an arithmetic number, because the mean of its divisors is an integer number (1083684).

Almost surely, 2^18973812 is an apocalyptic number.

18973812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18973812 is an abundant number, since it is smaller than the sum of its proper divisors (33043020).

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

18973812 is a wasteful number, since it uses less digits than its factorization.

18973812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11088 (or 11086 counting only the distinct ones).

The product of its digits is 24192, while the sum is 39.

The square root of 18973812 is about 4355.8939381027. The cubic root of 18973812 is about 266.7175118325.

The spelling of 18973812 in words is "eighteen million, nine hundred seventy-three thousand, eight hundred twelve".