18299844 has 72 divisors (see below), whose sum is σ = 48860448. Its totient is φ = 5987520.

The previous prime is 18299843. The next prime is 18299851. The reversal of 18299844 is 44899281.

It is a self number, because there is not a number n which added to its sum of digits gives 18299844.

It is not an unprimeable number, because it can be changed into a prime (18299843) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 64984 + ... + 65264.

Almost surely, 2^18299844 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 18299844, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24430224).

18299844 is an abundant number, since it is smaller than the sum of its proper divisors (30560604).

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

18299844 is a wasteful number, since it uses less digits than its factorization.

18299844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 367 (or 353 counting only the distinct ones).

The product of its digits is 165888, while the sum is 45.

The square root of 18299844 is about 4277.8316937439. The cubic root of 18299844 is about 263.5213434194.

The spelling of 18299844 in words is "eighteen million, two hundred ninety-nine thousand, eight hundred forty-four".