879998989 has 4 divisors (see below), whose sum is σ = 883130940. Its totient is φ = 876867040.

The previous prime is 879998969. The next prime is 879999007. The reversal of 879998989 is 989899978.

879998989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 712089225 + 167909764 = 26685^2 + 12958^2 .

It is a cyclic number.

It is not a de Polignac number, because 879998989 - 2⁵ = 879998957 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 (879998969) 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, 1565554 + ... + 1566115.

It is an arithmetic number, because the mean of its divisors is an integer number (220782735).

Almost surely, 2^879998989 is an apocalyptic number.

It is an amenable number.

879998989 is a deficient number, since it is larger than the sum of its proper divisors (3131951).

879998989 is a wasteful number, since it uses less digits than its factorization.

879998989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3131950.

The product of its digits is 211631616, while the sum is 76.

The square root of 879998989 is about 29664.7769079762. The cubic root of 879998989 is about 958.2836044332.

The spelling of 879998989 in words is "eight hundred seventy-nine million, nine hundred ninety-eight thousand, nine hundred eighty-nine".