879917989 has 4 divisors (see below), whose sum is σ = 880117056. Its totient is φ = 879718924.

The previous prime is 879917953. The next prime is 879917993. The reversal of 879917989 is 989719978.

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 879917989 - 2¹⁷ = 879786917 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 (879915989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 92749 + ... + 101794.

It is an arithmetic number, because the mean of its divisors is an integer number (220029264).

Almost surely, 2^879917989 is an apocalyptic number.

It is an amenable number.

879917989 is a deficient number, since it is larger than the sum of its proper divisors (199067).

879917989 is a wasteful number, since it uses less digits than its factorization.

879917989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199066.

The product of its digits is 20575296, while the sum is 67.

The square root of 879917989 is about 29663.4116210526. The cubic root of 879917989 is about 958.2542016140.

The spelling of 879917989 in words is "eight hundred seventy-nine million, nine hundred seventeen thousand, nine hundred eighty-nine".