18139609320 has 128 divisors (see below), whose sum is σ = 65466316800. Its totient is φ = 3927972096.

The previous prime is 18139609273. The next prime is 18139609321. The reversal of 18139609320 is 2390693181.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (18139609321) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 552324 + ... + 584243.

It is an arithmetic number, because the mean of its divisors is an integer number (511455600).

Almost surely, 2^18139609320 is an apocalyptic number.

18139609320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18139609320 is an abundant number, since it is smaller than the sum of its proper divisors (47326707480).

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

18139609320 is a wasteful number, since it uses less digits than its factorization.

18139609320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1136607 (or 1136603 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 42.

The spelling of 18139609320 in words is "eighteen billion, one hundred thirty-nine million, six hundred nine thousand, three hundred twenty".