18131976380 has 48 divisors (see below), whose sum is σ = 43545040896. Its totient is φ = 6212635200.

The previous prime is 18131976299. The next prime is 18131976383. The reversal of 18131976380 is 8367913181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18131976383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 178055 + ... + 260705.

It is an arithmetic number, because the mean of its divisors is an integer number (907188352).

Almost surely, 2^18131976380 is an apocalyptic number.

18131976380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18131976380 is an abundant number, since it is smaller than the sum of its proper divisors (25413064516).

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

18131976380 is a wasteful number, since it uses less digits than its factorization.

18131976380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84234 (or 84232 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 47.

The spelling of 18131976380 in words is "eighteen billion, one hundred thirty-one million, nine hundred seventy-six thousand, three hundred eighty".