999964879 has 4 divisors (see below), whose sum is σ = 1000048680. Its totient is φ = 999881080.

The previous prime is 999964873. The next prime is 999964897. The reversal of 999964879 is 978469999.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999964879 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 (999964873) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20284 + ... + 49105.

It is an arithmetic number, because the mean of its divisors is an integer number (250012170).

Almost surely, 2^999964879 is an apocalyptic number.

999964879 is a deficient number, since it is larger than the sum of its proper divisors (83801).

999964879 is a wasteful number, since it uses less digits than its factorization.

999964879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83800.

The product of its digits is 79361856, while the sum is 70.

The square root of 999964879 is about 31622.2212850394. The cubic root of 999964879 is about 999.9882928629.

The spelling of 999964879 in words is "nine hundred ninety-nine million, nine hundred sixty-four thousand, eight hundred seventy-nine".