18000396 has 36 divisors (see below), whose sum is σ = 45936072. Its totient is φ = 5942784.

The previous prime is 18000371. The next prime is 18000397. The reversal of 18000396 is 69300081.

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

It is not an unprimeable number, because it can be changed into a prime (18000397) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1516 + ... + 6188.

It is an arithmetic number, because the mean of its divisors is an integer number (1276002).

Almost surely, 2^18000396 is an apocalyptic number.

It is an amenable number.

18000396 is an abundant number, since it is smaller than the sum of its proper divisors (27935676).

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

18000396 is a wasteful number, since it uses less digits than its factorization.

18000396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4790 (or 4785 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 18000396 is about 4242.6873559102. The cubic root of 18000396 is about 262.0760612838.

The spelling of 18000396 in words is "eighteen million, three hundred ninety-six", and thus it is an aban number.