18999120 has 160 divisors (see below), whose sum is σ = 69138432. Its totient is φ = 4225536.

The previous prime is 18999119. The next prime is 18999131. The reversal of 18999120 is 2199981.

It is a happy number.

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, 72109 + ... + 72371.

Almost surely, 2^18999120 is an apocalyptic number.

18999120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18999120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34569216).

18999120 is an abundant number, since it is smaller than the sum of its proper divisors (50139312).

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

18999120 is a wasteful number, since it uses less digits than its factorization.

18999120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329 (or 323 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 39.

The square root of 18999120 is about 4358.7979994489. The cubic root of 18999120 is about 266.8360451710.

The spelling of 18999120 in words is "eighteen million, nine hundred ninety-nine thousand, one hundred twenty".