18386316 has 72 divisors (see below), whose sum is σ = 53018784. Its totient is φ = 5322240.

The previous prime is 18386309. The next prime is 18386321. The reversal of 18386316 is 61368381.

18386316 is a `hidden beast` number, since 18 + 3 + 8 + 631 + 6 = 666.

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 23 ways as a sum of consecutive naturals, for example, 6801 + ... + 9111.

It is an arithmetic number, because the mean of its divisors is an integer number (736372).

Almost surely, 2^18386316 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 18386316, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26509392).

18386316 is an abundant number, since it is smaller than the sum of its proper divisors (34632468).

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

18386316 is a wasteful number, since it uses less digits than its factorization.

18386316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2351 (or 2346 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 18386316 is about 4287.9267717628. The cubic root of 18386316 is about 263.9357626077.

The spelling of 18386316 in words is "eighteen million, three hundred eighty-six thousand, three hundred sixteen".