9990879 has 4 divisors (see below), whose sum is σ = 13321176. Its totient is φ = 6660584.

The previous prime is 9990863. The next prime is 9990887. The reversal of 9990879 is 9780999.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 9990879 - 2⁴ = 9990863 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9990859) 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, 1665144 + ... + 1665149.

It is an arithmetic number, because the mean of its divisors is an integer number (3330294).

Almost surely, 2^9990879 is an apocalyptic number.

9990879 is a deficient number, since it is larger than the sum of its proper divisors (3330297).

9990879 is a wasteful number, since it uses less digits than its factorization.

9990879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3330296.

The product of its (nonzero) digits is 367416, while the sum is 51.

The square root of 9990879 is about 3160.8351744436. The cubic root of 9990879 is about 215.3779470823.

The spelling of 9990879 in words is "nine million, nine hundred ninety thousand, eight hundred seventy-nine".