18436660 has 48 divisors (see below), whose sum is σ = 42561792. Its totient is φ = 6652800.

The previous prime is 18436651. The next prime is 18436673. The reversal of 18436660 is 6663481.

It is a Smith number, since the sum of its digits (34) coincides with the sum of the digits of its prime factors.

It is a congruent number.

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, 39589 + ... + 40051.

It is an arithmetic number, because the mean of its divisors is an integer number (886704).

Almost surely, 2^18436660 is an apocalyptic number.

18436660 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 18436660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21280896).

18436660 is an abundant number, since it is smaller than the sum of its proper divisors (24125132).

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

18436660 is a wasteful number, since it uses less digits than its factorization.

18436660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664 (or 662 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 18436660 is about 4293.7931948337. The cubic root of 18436660 is about 264.1764392930.

The spelling of 18436660 in words is "eighteen million, four hundred thirty-six thousand, six hundred sixty".