18156908 has 48 divisors (see below), whose sum is σ = 39965184. Its totient is φ = 7011840.

The previous prime is 18156857. The next prime is 18156911. The reversal of 18156908 is 80965181.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51260 + ... + 51612.

It is an arithmetic number, because the mean of its divisors is an integer number (832608).

Almost surely, 2^18156908 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 18156908, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19982592).

18156908 is an abundant number, since it is smaller than the sum of its proper divisors (21808276).

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

18156908 is a wasteful number, since it uses less digits than its factorization.

18156908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 542 (or 540 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 38.

The square root of 18156908 is about 4261.0923482131. The cubic root of 18156908 is about 262.8334471506.

The spelling of 18156908 in words is "eighteen million, one hundred fifty-six thousand, nine hundred eight".