18158322 has 48 divisors (see below), whose sum is σ = 45505152. Its totient is φ = 4788000.

The previous prime is 18158317. The next prime is 18158323. The reversal of 18158322 is 22385181.

It is a self number, because there is not a number n which added to its sum of digits gives 18158322.

It is not an unprimeable number, because it can be changed into a prime (18158323) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 1447 + ... + 6197.

It is an arithmetic number, because the mean of its divisors is an integer number (948024).

Almost surely, 2^18158322 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18158322, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22752576).

18158322 is an abundant number, since it is smaller than the sum of its proper divisors (27346830).

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

18158322 is a wasteful number, since it uses less digits than its factorization.

18158322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4783 (or 4776 counting only the distinct ones).

The product of its digits is 3840, while the sum is 30.

The square root of 18158322 is about 4261.2582648790. The cubic root of 18158322 is about 262.8402698403.

The spelling of 18158322 in words is "eighteen million, one hundred fifty-eight thousand, three hundred twenty-two".