18219639800 has 48 divisors (see below), whose sum is σ = 42429605760. Its totient is φ = 7275994880.

The previous prime is 18219639793. The next prime is 18219639829. The reversal of 18219639800 is 893691281.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 49577 + ... + 197223.

It is an arithmetic number, because the mean of its divisors is an integer number (883950120).

Almost surely, 2^18219639800 is an apocalyptic number.

18219639800 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18219639800 is an abundant number, since it is smaller than the sum of its proper divisors (24209965960).

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

18219639800 is a wasteful number, since it uses less digits than its factorization.

18219639800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148280 (or 148271 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 47.

The spelling of 18219639800 in words is "eighteen billion, two hundred nineteen million, six hundred thirty-nine thousand, eight hundred".