18513222 has 64 divisors (see below), whose sum is σ = 46738944. Its totient is φ = 4757760.

The previous prime is 18513217. The next prime is 18513259. The reversal of 18513222 is 22231581.

It is a junction number, because it is equal to n+sod(n) for n = 18513192 and 18513201.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21973 + ... + 22799.

It is an arithmetic number, because the mean of its divisors is an integer number (730296).

Almost surely, 2^18513222 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18513222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23369472).

18513222 is an abundant number, since it is smaller than the sum of its proper divisors (28225722).

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

18513222 is a wasteful number, since it uses less digits than its factorization.

18513222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 893.

The product of its digits is 960, while the sum is 24.

The square root of 18513222 is about 4302.6993852697. The cubic root of 18513222 is about 264.5416164924.

The spelling of 18513222 in words is "eighteen million, five hundred thirteen thousand, two hundred twenty-two".