9999879 has 8 divisors (see below), whose sum is σ = 13693680. Its totient is φ = 6486336.

The previous prime is 9999877. The next prime is 9999883. The reversal of 9999879 is 9789999.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 9999879 - 2¹ = 9999877 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9999877) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44934 + ... + 45155.

It is an arithmetic number, because the mean of its divisors is an integer number (1711710).

Almost surely, 2^9999879 is an apocalyptic number.

9999879 is a deficient number, since it is larger than the sum of its proper divisors (3693801).

9999879 is a wasteful number, since it uses less digits than its factorization.

9999879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90129.

The product of its digits is 3306744, while the sum is 60.

The square root of 9999879 is about 3162.2585283307. The cubic root of 9999879 is about 215.4426000444.

It can be divided in two parts, 9999 and 879, that added together give a triangular number (10878 = T₁₄₇).

The spelling of 9999879 in words is "nine million, nine hundred ninety-nine thousand, eight hundred seventy-nine".