18367812 has 18 divisors (see below), whose sum is σ = 46429838. Its totient is φ = 6122592.

The previous prime is 18367807. The next prime is 18367831. The reversal of 18367812 is 21876381.

It can be written as a sum of positive squares in only one way, i.e., 14930496 + 3437316 = 3864^2 + 1854^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 510217 = 18367812 / (1 + 8 + 3 + 6 + 7 + 8 + 1 + 2).

It is an alternating number because its digits alternate between odd and even.

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, 255073 + ... + 255144.

Almost surely, 2^18367812 is an apocalyptic number.

18367812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18367812 is an abundant number, since it is smaller than the sum of its proper divisors (28062026).

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

18367812 is a wasteful number, since it uses less digits than its factorization.

18367812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510227 (or 510222 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 18367812 is about 4285.7685425137. The cubic root of 18367812 is about 263.8471911824.

The spelling of 18367812 in words is "eighteen million, three hundred sixty-seven thousand, eight hundred twelve".