879640 has 16 divisors (see below), whose sum is σ = 1979280. Its totient is φ = 351840.

The previous prime is 879629. The next prime is 879649. The reversal of 879640 is 46978.

It is a junction number, because it is equal to n+sod(n) for n = 879596 and 879605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (879649) 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, 10956 + ... + 11035.

It is an arithmetic number, because the mean of its divisors is an integer number (123705).

2⁸⁷⁹⁶⁴⁰ is an apocalyptic number.

It is an amenable number.

879640 is an abundant number, since it is smaller than the sum of its proper divisors (1099640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

879640 is a wasteful number, since it uses less digits than its factorization.

879640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22002 (or 21998 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 879640 is about 937.8912516918. The cubic root of 879640 is about 95.8153278502.

It can be divided in two parts, 8796 and 40, that added together give a square (8836 = 94²).

The spelling of 879640 in words is "eight hundred seventy-nine thousand, six hundred forty".