990879 has 8 divisors (see below), whose sum is σ = 1398960. Its totient is φ = 621696.

The previous prime is 990851. The next prime is 990881. The reversal of 990879 is 978099.

It is a happy number.

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

It is not a de Polignac number, because 990879 - 2¹³ = 982687 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 990879.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990809) 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, 9664 + ... + 9765.

It is an arithmetic number, because the mean of its divisors is an integer number (174870).

2⁹⁹⁰⁸⁷⁹ is an apocalyptic number.

990879 is a deficient number, since it is larger than the sum of its proper divisors (408081).

990879 is a wasteful number, since it uses less digits than its factorization.

990879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19449.

The product of its (nonzero) digits is 40824, while the sum is 42.

The square root of 990879 is about 995.4290532228. The cubic root of 990879 is about 99.6950375914.

The spelling of 990879 in words is "nine hundred ninety thousand, eight hundred seventy-nine".