879989 has 4 divisors (see below), whose sum is σ = 960000. Its totient is φ = 799980.

The previous prime is 879979. The next prime is 880001. The reversal of 879989 is 989978.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 879989 - 2⁴ = 879973 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 (879919) 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 3 ways as a sum of consecutive naturals, for example, 39989 + ... + 40010.

It is an arithmetic number, because the mean of its divisors is an integer number (240000).

2⁸⁷⁹⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

879989 is a deficient number, since it is larger than the sum of its proper divisors (80011).

879989 is a wasteful number, since it uses less digits than its factorization.

879989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80010.

The product of its digits is 326592, while the sum is 50.

The square root of 879989 is about 938.0772889267. The cubic root of 879989 is about 95.8279978546.

It can be divided in two parts, 8799 and 89, that added together give a palindrome (8888).

The spelling of 879989 in words is "eight hundred seventy-nine thousand, nine hundred eighty-nine".