19890389800 has 48 divisors (see below), whose sum is σ = 46255968000. Its totient is φ = 7954296000.

The previous prime is 19890389797. The next prime is 19890389839. The reversal of 19890389800 is 898309891.

It is a hoax number, since the sum of its digits (55) coincides with the sum of the digits of its distinct prime factors.

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, 1121401 + ... + 1138999.

It is an arithmetic number, because the mean of its divisors is an integer number (963666000).

Almost surely, 2^19890389800 is an apocalyptic number.

19890389800 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19890389800 is an abundant number, since it is smaller than the sum of its proper divisors (26365578200).

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

19890389800 is a wasteful number, since it uses less digits than its factorization.

19890389800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23266 (or 23257 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 55.

The spelling of 19890389800 in words is "nineteen billion, eight hundred ninety million, three hundred eighty-nine thousand, eight hundred".