999886979 has 24 divisors (see below), whose sum is σ = 1241091360. Its totient is φ = 788755968.

The previous prime is 999886931. The next prime is 999886991. The reversal of 999886979 is 979688999.

It is not a de Polignac number, because 999886979 - 2¹⁶ = 999821443 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999886919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 468587 + ... + 470715.

It is an arithmetic number, because the mean of its divisors is an integer number (51712140).

Almost surely, 2^999886979 is an apocalyptic number.

999886979 is a deficient number, since it is larger than the sum of its proper divisors (241204381).

999886979 is a wasteful number, since it uses less digits than its factorization.

999886979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2559 (or 2546 counting only the distinct ones).

The product of its digits is 158723712, while the sum is 74.

The square root of 999886979 is about 31620.9895322711. The cubic root of 999886979 is about 999.9623249139.

The spelling of 999886979 in words is "nine hundred ninety-nine million, eight hundred eighty-six thousand, nine hundred seventy-nine".