18238812 has 12 divisors (see below), whose sum is σ = 42557256. Its totient is φ = 6079600.

The previous prime is 18238811. The next prime is 18238849. The reversal of 18238812 is 21883281.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18238811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 759939 + ... + 759962.

It is an arithmetic number, because the mean of its divisors is an integer number (3546438).

Almost surely, 2^18238812 is an apocalyptic number.

18238812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18238812 is an abundant number, since it is smaller than the sum of its proper divisors (24318444).

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

18238812 is a wasteful number, since it uses less digits than its factorization.

18238812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1519908 (or 1519906 counting only the distinct ones).

The product of its digits is 6144, while the sum is 33.

The square root of 18238812 is about 4270.6922155548. The cubic root of 18238812 is about 263.2280595418.

The spelling of 18238812 in words is "eighteen million, two hundred thirty-eight thousand, eight hundred twelve".