18315966 has 8 divisors (see below), whose sum is σ = 36631944. Its totient is φ = 6105320.

The previous prime is 18315961. The next prime is 18315977. The reversal of 18315966 is 66951381.

It is a sphenic number, since it is the product of 3 distinct primes.

18315966 is an admirable number.

It is a super-2 number, since 2×18315966² = 670949221026312, which contains 22 as substring.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18315961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1526325 + ... + 1526336.

It is an arithmetic number, because the mean of its divisors is an integer number (4578993).

Almost surely, 2^18315966 is an apocalyptic number.

18315966 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

18315966 is a wasteful number, since it uses less digits than its factorization.

18315966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3052666.

The product of its digits is 38880, while the sum is 39.

The square root of 18315966 is about 4279.7156447596. The cubic root of 18315966 is about 263.5987073590.

The spelling of 18315966 in words is "eighteen million, three hundred fifteen thousand, nine hundred sixty-six".