879509 has 4 divisors (see below), whose sum is σ = 892704. Its totient is φ = 866316.

The previous prime is 879493. The next prime is 879523. The reversal of 879509 is 905978.

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, and also an emirpimes, since its reverse is a distinct semiprime: 905978 = 2 ⋅452989.

It is a cyclic number.

It is not a de Polignac number, because 879509 - 2⁴ = 879493 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (879539) 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, 6497 + ... + 6630.

It is an arithmetic number, because the mean of its divisors is an integer number (223176).

2⁸⁷⁹⁵⁰⁹ is an apocalyptic number.

It is an amenable number.

879509 is a deficient number, since it is larger than the sum of its proper divisors (13195).

879509 is a wasteful number, since it uses less digits than its factorization.

879509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13194.

The product of its (nonzero) digits is 22680, while the sum is 38.

The square root of 879509 is about 937.8214115705. The cubic root of 879509 is about 95.8105711956.

The spelling of 879509 in words is "eight hundred seventy-nine thousand, five hundred nine".