18336690 has 48 divisors (see below), whose sum is σ = 48297600. Its totient is φ = 4826016.

The previous prime is 18336683. The next prime is 18336701. The reversal of 18336690 is 9663381.

It is a happy number.

It is a super-2 number, since 2×18336690² = 672468400312200, which contains 22 as substring.

It is a Curzon 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, 5821 + ... + 8399.

It is an arithmetic number, because the mean of its divisors is an integer number (1006200).

Almost surely, 2^18336690 is an apocalyptic number.

18336690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18336690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24148800).

18336690 is an abundant number, since it is smaller than the sum of its proper divisors (29960910).

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

18336690 is a wasteful number, since it uses less digits than its factorization.

18336690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2671 (or 2668 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 18336690 is about 4282.1361491667. The cubic root of 18336690 is about 263.6980880590.

The spelling of 18336690 in words is "eighteen million, three hundred thirty-six thousand, six hundred ninety".