879913821 has 8 divisors (see below), whose sum is σ = 1173391840. Its totient is φ = 586522512.

The previous prime is 879913813. The next prime is 879913843. The reversal of 879913821 is 128319978.

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

It is not a de Polignac number, because 879913821 - 2³ = 879913813 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 (879913861) 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 7 ways as a sum of consecutive naturals, for example, 7686 + ... + 42648.

It is an arithmetic number, because the mean of its divisors is an integer number (146673980).

Almost surely, 2^879913821 is an apocalyptic number.

It is an amenable number.

879913821 is a deficient number, since it is larger than the sum of its proper divisors (293478019).

879913821 is a wasteful number, since it uses less digits than its factorization.

879913821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43355.

The product of its digits is 217728, while the sum is 48.

The square root of 879913821 is about 29663.3413660700. The cubic root of 879913821 is about 958.2526885905.

The spelling of 879913821 in words is "eight hundred seventy-nine million, nine hundred thirteen thousand, eight hundred twenty-one".