18318456 has 48 divisors (see below), whose sum is σ = 53431560. Its totient is φ = 5636160.

The previous prime is 18318449. The next prime is 18318457. The reversal of 18318456 is 65481381.

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

It is a self number, because there is not a number n which added to its sum of digits gives 18318456.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18318457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8850 + ... + 10721.

Almost surely, 2^18318456 is an apocalyptic number.

It is an amenable number.

18318456 is an abundant number, since it is smaller than the sum of its proper divisors (35113104).

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

18318456 is a wasteful number, since it uses less digits than its factorization.

18318456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19596 (or 19589 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 18318456 is about 4280.0065420511. The cubic root of 18318456 is about 263.6106519659.

The spelling of 18318456 in words is "eighteen million, three hundred eighteen thousand, four hundred fifty-six".