18117936 has 60 divisors (see below), whose sum is σ = 51803232. Its totient is φ = 5908608.

The previous prime is 18117923. The next prime is 18117959. The reversal of 18117936 is 63971181.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 18117936.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5430 + ... + 8106.

Almost surely, 2^18117936 is an apocalyptic number.

18117936 is a gapful number since it is divisible by the number (16) 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 18117936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25901616).

18117936 is an abundant number, since it is smaller than the sum of its proper divisors (33685296).

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

18117936 is a wasteful number, since it uses less digits than its factorization.

18117936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2738 (or 2729 counting only the distinct ones).

The product of its digits is 9072, while the sum is 36.

The square root of 18117936 is about 4256.5168859057. The cubic root of 18117936 is about 262.6452638159.

The spelling of 18117936 in words is "eighteen million, one hundred seventeen thousand, nine hundred thirty-six".