18381323730 has 64 divisors (see below), whose sum is σ = 55000747008. Its totient is φ = 3819495360.

The previous prime is 18381323717. The next prime is 18381323749. The reversal of 18381323730 is 3732318381.

It is a happy number.

It is a super-2 number, since 2×18381323730² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3976332 + ... + 3980951.

It is an arithmetic number, because the mean of its divisors is an integer number (859386672).

Almost surely, 2^18381323730 is an apocalyptic number.

18381323730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18381323730 is an abundant number, since it is smaller than the sum of its proper divisors (36619423278).

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

18381323730 is a wasteful number, since it uses less digits than its factorization.

18381323730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7957311.

The product of its (nonzero) digits is 72576, while the sum is 39.

The spelling of 18381323730 in words is "eighteen billion, three hundred eighty-one million, three hundred twenty-three thousand, seven hundred thirty".