19929879 has 12 divisors (see below), whose sum is σ = 30303000. Its totient is φ = 12587184.

The previous prime is 19929863. The next prime is 19929893. The reversal of 19929879 is 97892991.

It is not a de Polignac number, because 19929879 - 2⁴ = 19929863 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19929979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 58104 + ... + 58445.

It is an arithmetic number, because the mean of its divisors is an integer number (2525250).

Almost surely, 2^19929879 is an apocalyptic number.

19929879 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

19929879 is a deficient number, since it is larger than the sum of its proper divisors (10373121).

19929879 is a wasteful number, since it uses less digits than its factorization.

19929879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116574 (or 116571 counting only the distinct ones).

The product of its digits is 734832, while the sum is 54.

The square root of 19929879 is about 4464.2893051414. The cubic root of 19929879 is about 271.1241607321.

The spelling of 19929879 in words is "nineteen million, nine hundred twenty-nine thousand, eight hundred seventy-nine".