18818156 has 36 divisors (see below), whose sum is σ = 38907288. Its totient is φ = 7939008.

The previous prime is 18818131. The next prime is 18818207. The reversal of 18818156 is 65181881.

It is a congruent number.

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, 12416 + ... + 13848.

It is an arithmetic number, because the mean of its divisors is an integer number (1080758).

Almost surely, 2^18818156 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 18818156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19453644).

18818156 is an abundant number, since it is smaller than the sum of its proper divisors (20089132).

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

18818156 is a wasteful number, since it uses less digits than its factorization.

18818156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1518 (or 1509 counting only the distinct ones).

The product of its digits is 15360, while the sum is 38.

The square root of 18818156 is about 4337.9898570651. The cubic root of 18818156 is about 265.9861488632.

The spelling of 18818156 in words is "eighteen million, eight hundred eighteen thousand, one hundred fifty-six".