18159822 has 64 divisors (see below), whose sum is σ = 42408000. Its totient is φ = 5754240.

The previous prime is 18159797. The next prime is 18159833. The reversal of 18159822 is 22895181.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 121804 + ... + 121952.

It is an arithmetic number, because the mean of its divisors is an integer number (662625).

Almost surely, 2^18159822 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18159822, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21204000).

18159822 is an abundant number, since it is smaller than the sum of its proper divisors (24248178).

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

18159822 is a wasteful number, since it uses less digits than its factorization.

18159822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258 (or 252 counting only the distinct ones).

The product of its digits is 11520, while the sum is 36.

The square root of 18159822 is about 4261.4342655965. The cubic root of 18159822 is about 262.8475071013.

It can be divided in two parts, 18159 and 822, that added together give a palindrome (18981).

The spelling of 18159822 in words is "eighteen million, one hundred fifty-nine thousand, eight hundred twenty-two".