878909 has 4 divisors (see below), whose sum is σ = 891360. Its totient is φ = 866460.

The previous prime is 878893. The next prime is 878929. The reversal of 878909 is 909878.

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 878909 - 2⁴ = 878893 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (878929) 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, 6119 + ... + 6260.

It is an arithmetic number, because the mean of its divisors is an integer number (222840).

2⁸⁷⁸⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

878909 is a deficient number, since it is larger than the sum of its proper divisors (12451).

878909 is a wasteful number, since it uses less digits than its factorization.

878909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12450.

The product of its (nonzero) digits is 36288, while the sum is 41.

The square root of 878909 is about 937.5014666655. The cubic root of 878909 is about 95.7887789531.

The spelling of 878909 in words is "eight hundred seventy-eight thousand, nine hundred nine".