18210906 has 96 divisors (see below), whose sum is σ = 48117888. Its totient is φ = 5054400.

The previous prime is 18210851. The next prime is 18210931. The reversal of 18210906 is 60901281.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 18210906.

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 47 ways as a sum of consecutive naturals, for example, 180256 + ... + 180356.

It is an arithmetic number, because the mean of its divisors is an integer number (501228).

Almost surely, 2^18210906 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18210906, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24058944).

18210906 is an abundant number, since it is smaller than the sum of its proper divisors (29906982).

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

18210906 is a wasteful number, since it uses less digits than its factorization.

18210906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178 (or 166 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 18210906 is about 4267.4238130282. The cubic root of 18210906 is about 263.0937417332.

The spelling of 18210906 in words is "eighteen million, two hundred ten thousand, nine hundred six".