19968879 has 16 divisors (see below), whose sum is σ = 30652160. Its totient is φ = 11327040.

The previous prime is 19968877. The next prime is 19968889. The reversal of 19968879 is 97886991.

It is not a de Polignac number, because 19968879 - 2¹ = 19968877 is a prime.

It is a super-2 number, since 2×19968879² = 797512257033282, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19968877) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 502 + ... + 6339.

It is an arithmetic number, because the mean of its divisors is an integer number (1915760).

Almost surely, 2^19968879 is an apocalyptic number.

19968879 is a deficient number, since it is larger than the sum of its proper divisors (10683281).

19968879 is a wasteful number, since it uses less digits than its factorization.

19968879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6990.

The product of its digits is 1959552, while the sum is 57.

The square root of 19968879 is about 4468.6551668259. The cubic root of 19968879 is about 271.3008962519.

The spelling of 19968879 in words is "nineteen million, nine hundred sixty-eight thousand, eight hundred seventy-nine".