18357864 has 64 divisors (see below), whose sum is σ = 54743040. Its totient is φ = 5016000.

The previous prime is 18357847. The next prime is 18357877. The reversal of 18357864 is 46875381.

It is a super-2 number, since 2×18357864² = 674022341284992, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

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, 1489 + ... + 6239.

It is an arithmetic number, because the mean of its divisors is an integer number (855360).

Almost surely, 2^18357864 is an apocalyptic number.

18357864 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18357864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27371520).

18357864 is an abundant number, since it is smaller than the sum of its proper divisors (36385176).

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

18357864 is a wasteful number, since it uses less digits than its factorization.

18357864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4790 (or 4786 counting only the distinct ones).

The product of its digits is 161280, while the sum is 42.

The square root of 18357864 is about 4284.6078000209. The cubic root of 18357864 is about 263.7995494009.

The spelling of 18357864 in words is "eighteen million, three hundred fifty-seven thousand, eight hundred sixty-four".