18306864 has 80 divisors (see below), whose sum is σ = 54282240. Its totient is φ = 5901120.

The previous prime is 18306839. The next prime is 18306887. The reversal of 18306864 is 46860381.

It is a happy number.

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

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, 12709 + ... + 14075.

It is an arithmetic number, because the mean of its divisors is an integer number (678528).

Almost surely, 2^18306864 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18306864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27141120).

18306864 is an abundant number, since it is smaller than the sum of its proper divisors (35975376).

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

18306864 is a wasteful number, since it uses less digits than its factorization.

18306864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1415 (or 1403 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 18306864 is about 4278.6521242092. The cubic root of 18306864 is about 263.5550355705. Note that the first 3 decimals are identical.

The spelling of 18306864 in words is "eighteen million, three hundred six thousand, eight hundred sixty-four".