19438866860 has 48 divisors (see below), whose sum is σ = 47914192704. Its totient is φ = 6484624128.

The previous prime is 19438866859. The next prime is 19438866877. The reversal of 19438866860 is 6866883491.

It is a self number, because there is not a number n which added to its sum of digits gives 19438866860.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1871159 + ... + 1881518.

It is an arithmetic number, because the mean of its divisors is an integer number (998212348).

Almost surely, 2^19438866860 is an apocalyptic number.

19438866860 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19438866860 is an abundant number, since it is smaller than the sum of its proper divisors (28475325844).

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

19438866860 is a wasteful number, since it uses less digits than its factorization.

19438866860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3752730 (or 3752728 counting only the distinct ones).

The product of its (nonzero) digits is 11943936, while the sum is 59.

The spelling of 19438866860 in words is "nineteen billion, four hundred thirty-eight million, eight hundred sixty-six thousand, eight hundred sixty".