18358944 has 72 divisors (see below), whose sum is σ = 50047200. Its totient is φ = 5892480.

The previous prime is 18358927. The next prime is 18358957. The reversal of 18358944 is 44985381.

It is a junction number, because it is equal to n+sod(n) for n = 18358896 and 18358905.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 92157 + ... + 92355.

It is an arithmetic number, because the mean of its divisors is an integer number (695100).

Almost surely, 2^18358944 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 18358944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25023600).

18358944 is an abundant number, since it is smaller than the sum of its proper divisors (31688256).

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

18358944 is a wasteful number, since it uses less digits than its factorization.

18358944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274 (or 235 counting only the distinct ones).

The product of its digits is 138240, while the sum is 42.

The square root of 18358944 is about 4284.7338307064. The cubic root of 18358944 is about 263.8047224415.

The spelling of 18358944 in words is "eighteen million, three hundred fifty-eight thousand, nine hundred forty-four".