18618936 has 96 divisors (see below), whose sum is σ = 56327040. Its totient is φ = 5023296.

The previous prime is 18618923. The next prime is 18618947. The reversal of 18618936 is 63981681.

It is a Harshad number since it is a multiple of its sum of digits (42).

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, 60495 + ... + 60801.

It is an arithmetic number, because the mean of its divisors is an integer number (586740).

Almost surely, 2^18618936 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 18618936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28163520).

18618936 is an abundant number, since it is smaller than the sum of its proper divisors (37708104).

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

18618936 is a wasteful number, since it uses less digits than its factorization.

18618936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361 (or 338 counting only the distinct ones).

The product of its digits is 62208, while the sum is 42.

The square root of 18618936 is about 4314.9665120369. The cubic root of 18618936 is about 265.0441886677.

The spelling of 18618936 in words is "eighteen million, six hundred eighteen thousand, nine hundred thirty-six".