878391 has 8 divisors (see below), whose sum is σ = 1301360. Its totient is φ = 585576.

The previous prime is 878387. The next prime is 878411. The reversal of 878391 is 193878.

It is not a de Polignac number, because 878391 - 2² = 878387 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (878191) 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, 16240 + ... + 16293.

It is an arithmetic number, because the mean of its divisors is an integer number (162670).

2⁸⁷⁸³⁹¹ is an apocalyptic number.

878391 is a deficient number, since it is larger than the sum of its proper divisors (422969).

878391 is a wasteful number, since it uses less digits than its factorization.

878391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32542 (or 32536 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 878391 is about 937.2251597135. The cubic root of 878391 is about 95.7699570051.

The spelling of 878391 in words is "eight hundred seventy-eight thousand, three hundred ninety-one".