879639 has 4 divisors (see below), whose sum is σ = 1172856. Its totient is φ = 586424.

The previous prime is 879629. The next prime is 879649. The reversal of 879639 is 936978.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (879629) and next prime (879649).

It is a cyclic number.

It is not a de Polignac number, because 879639 - 2⁴ = 879623 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 879639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (879629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 146604 + ... + 146609.

It is an arithmetic number, because the mean of its divisors is an integer number (293214).

2⁸⁷⁹⁶³⁹ is an apocalyptic number.

879639 is a deficient number, since it is larger than the sum of its proper divisors (293217).

879639 is a wasteful number, since it uses less digits than its factorization.

879639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293216.

The product of its digits is 81648, while the sum is 42.

The square root of 879639 is about 937.8907185808. The cubic root of 879639 is about 95.8152915417.

The spelling of 879639 in words is "eight hundred seventy-nine thousand, six hundred thirty-nine".