18239120 has 20 divisors (see below), whose sum is σ = 42406140. Its totient is φ = 7295616.

The previous prime is 18239101. The next prime is 18239141. The reversal of 18239120 is 2193281.

It can be written as a sum of positive squares in 2 ways, for example, as 9759376 + 8479744 = 3124^2 + 2912^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 18239120.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113915 + ... + 114074.

It is an arithmetic number, because the mean of its divisors is an integer number (2120307).

Almost surely, 2^18239120 is an apocalyptic number.

18239120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18239120 is an abundant number, since it is smaller than the sum of its proper divisors (24167020).

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

18239120 is a wasteful number, since it uses less digits than its factorization.

18239120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228002 (or 227996 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 18239120 is about 4270.7282751306. The cubic root of 18239120 is about 263.2295412499.

The spelling of 18239120 in words is "eighteen million, two hundred thirty-nine thousand, one hundred twenty".