18303781900 has 18 divisors (see below), whose sum is σ = 39719206940. Its totient is φ = 7321512720.

The previous prime is 18303781891. The next prime is 18303781957. The reversal of 18303781900 is 918730381.

It is a super-2 number, since 2×18303781900² (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 5 ways as a sum of consecutive naturals, for example, 91518810 + ... + 91519009.

Almost surely, 2^18303781900 is an apocalyptic number.

18303781900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18303781900 is an abundant number, since it is smaller than the sum of its proper divisors (21415425040).

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

18303781900 is a wasteful number, since it uses less digits than its factorization.

18303781900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183037833 (or 183037826 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 40.

The spelling of 18303781900 in words is "eighteen billion, three hundred three million, seven hundred eighty-one thousand, nine hundred".