18315700 has 72 divisors (see below), whose sum is σ = 43613528. Its totient is φ = 6635520.

The previous prime is 18315697. The next prime is 18315727. The reversal of 18315700 is 751381.

It can be written as a sum of positive squares in 12 ways, for example, as 9998244 + 8317456 = 3162^2 + 2884^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 94804 + ... + 94996.

Almost surely, 2^18315700 is an apocalyptic number.

18315700 is a gapful number since it is divisible by the number (10) 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 18315700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21806764).

18315700 is an abundant number, since it is smaller than the sum of its proper divisors (25297828).

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

18315700 is a wasteful number, since it uses less digits than its factorization.

18315700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293 (or 286 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 25.

The square root of 18315700 is about 4279.6845678157. The cubic root of 18315700 is about 263.5974312848.

The spelling of 18315700 in words is "eighteen million, three hundred fifteen thousand, seven hundred".