878509 has 8 divisors (see below), whose sum is σ = 960768. Its totient is φ = 799680.

The previous prime is 878489. The next prime is 878513. The reversal of 878509 is 905878.

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

It is not a de Polignac number, because 878509 - 2⁹ = 877997 is a prime.

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

It is a Duffinian number.

878509 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (878539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 307 + ... + 1360.

It is an arithmetic number, because the mean of its divisors is an integer number (120096).

2⁸⁷⁸⁵⁰⁹ is an apocalyptic number.

It is an amenable number.

878509 is a deficient number, since it is larger than the sum of its proper divisors (82259).

878509 is a wasteful number, since it uses less digits than its factorization.

878509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1715.

The product of its (nonzero) digits is 20160, while the sum is 37.

The square root of 878509 is about 937.2881093879. The cubic root of 878509 is about 95.7742452810.

The spelling of 878509 in words is "eight hundred seventy-eight thousand, five hundred nine".