18806385380 has 48 divisors (see below), whose sum is σ = 40281421824. Its totient is φ = 7372759680.

The previous prime is 18806385361. The next prime is 18806385397. The reversal of 18806385380 is 8358360881.

It is a super-2 number, since 2×18806385380² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1041509 + ... + 1059411.

It is an arithmetic number, because the mean of its divisors is an integer number (839196288).

Almost surely, 2^18806385380 is an apocalyptic number.

18806385380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18806385380 is an abundant number, since it is smaller than the sum of its proper divisors (21475036444).

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

18806385380 is a wasteful number, since it uses less digits than its factorization.

18806385380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18956 (or 18954 counting only the distinct ones).

The product of its (nonzero) digits is 1105920, while the sum is 50.

The spelling of 18806385380 in words is "eighteen billion, eight hundred six million, three hundred eighty-five thousand, three hundred eighty".