19979137884 has 12 divisors (see below), whose sum is σ = 46617988424. Its totient is φ = 6659712624.

The previous prime is 19979137873. The next prime is 19979137891. The reversal of 19979137884 is 48873197991.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 832464067 + ... + 832464090.

Almost surely, 2^19979137884 is an apocalyptic number.

It is an amenable number.

19979137884 is an abundant number, since it is smaller than the sum of its proper divisors (26638850540).

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

19979137884 is a wasteful number, since it uses less digits than its factorization.

19979137884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1664928164 (or 1664928162 counting only the distinct ones).

The product of its digits is 27433728, while the sum is 66.

The spelling of 19979137884 in words is "nineteen billion, nine hundred seventy-nine million, one hundred thirty-seven thousand, eight hundred eighty-four".