19886979412 has 12 divisors (see below), whose sum is σ = 34809306336. Its totient is φ = 9941463320.

The previous prime is 19886979391. The next prime is 19886979421. The reversal of 19886979412 is 21497968891.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 484408 + ... + 523855.

It is an arithmetic number, because the mean of its divisors is an integer number (2900775528).

Almost surely, 2^19886979412 is an apocalyptic number.

It is an amenable number.

19886979412 is a deficient number, since it is larger than the sum of its proper divisors (14922326924).

19886979412 is a wasteful number, since it uses less digits than its factorization.

19886979412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1013198 (or 1013196 counting only the distinct ones).

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

The spelling of 19886979412 in words is "nineteen billion, eight hundred eighty-six million, nine hundred seventy-nine thousand, four hundred twelve".