18400030320 has 160 divisors (see below), whose sum is σ = 65365673472. Its totient is φ = 4194302976.

The previous prime is 18400030303. The next prime is 18400030391. The reversal of 18400030320 is 2303000481.

It is a happy number.

It is a super-2 number, since 2×18400030320² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

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, 611959 + ... + 641321.

Almost surely, 2^18400030320 is an apocalyptic number.

18400030320 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 18400030320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32682836736).

18400030320 is an abundant number, since it is smaller than the sum of its proper divisors (46965643152).

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

18400030320 is a wasteful number, since it uses less digits than its factorization.

18400030320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29759 (or 29753 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The spelling of 18400030320 in words is "eighteen billion, four hundred million, thirty thousand, three hundred twenty".