18729899830 has 16 divisors (see below), whose sum is σ = 33761926224. Its totient is φ = 7481269600.

The previous prime is 18729899813. The next prime is 18729899849. The reversal of 18729899830 is 3899892781.

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, 1328932 + ... + 1342951.

It is an arithmetic number, because the mean of its divisors is an integer number (2110120389).

Almost surely, 2^18729899830 is an apocalyptic number.

18729899830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18729899830 is a deficient number, since it is larger than the sum of its proper divisors (15032026394).

18729899830 is a wasteful number, since it uses less digits than its factorization.

18729899830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2672591.

The product of its (nonzero) digits is 15676416, while the sum is 64.

The spelling of 18729899830 in words is "eighteen billion, seven hundred twenty-nine million, eight hundred ninety-nine thousand, eight hundred thirty".