18239393040 has 160 divisors (see below), whose sum is σ = 61812329472. Its totient is φ = 4412352000.

The previous prime is 18239393017. The next prime is 18239393059. The reversal of 18239393040 is 4039393281.

It is a junction number, because it is equal to n+sod(n) for n = 18239392983 and 18239393001.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1289205 + ... + 1303275.

Almost surely, 2^18239393040 is an apocalyptic number.

18239393040 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 18239393040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30906164736).

18239393040 is an abundant number, since it is smaller than the sum of its proper divisors (43572936432).

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

18239393040 is a wasteful number, since it uses less digits than its factorization.

18239393040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14589 (or 14583 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 42.

The spelling of 18239393040 in words is "eighteen billion, two hundred thirty-nine million, three hundred ninety-three thousand, forty".