18444120 has 32 divisors (see below), whose sum is σ = 55332720. Its totient is φ = 4918400.

The previous prime is 18444077. The next prime is 18444121. The reversal of 18444120 is 2144481.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18444121) 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 7 ways as a sum of consecutive naturals, for example, 76731 + ... + 76970.

Almost surely, 2^18444120 is an apocalyptic number.

18444120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18444120 is an abundant number, since it is smaller than the sum of its proper divisors (36888600).

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

18444120 is a wasteful number, since it uses less digits than its factorization.

18444120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153715 (or 153711 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 24.

The square root of 18444120 is about 4294.6618027500. The cubic root of 18444120 is about 264.2120656029.

The spelling of 18444120 in words is "eighteen million, four hundred forty-four thousand, one hundred twenty".