18731969990 has 16 divisors (see below), whose sum is σ = 33720364800. Its totient is φ = 7492161600.

The previous prime is 18731969989. The next prime is 18731970011. The reversal of 18731969990 is 9996913781.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58715 + ... + 202265.

It is an arithmetic number, because the mean of its divisors is an integer number (2107522800).

Almost surely, 2^18731969990 is an apocalyptic number.

18731969990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18731969990 is a deficient number, since it is larger than the sum of its proper divisors (14988394810).

18731969990 is a wasteful number, since it uses less digits than its factorization.

18731969990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156607.

The product of its (nonzero) digits is 6613488, while the sum is 62.

The spelling of 18731969990 in words is "eighteen billion, seven hundred thirty-one million, nine hundred sixty-nine thousand, nine hundred ninety".