878139 has 6 divisors (see below), whose sum is σ = 1268436. Its totient is φ = 585420.

The previous prime is 878131. The next prime is 878147. The reversal of 878139 is 931878.

It is an interprime number because it is at equal distance from previous prime (878131) and next prime (878147).

It is not a de Polignac number, because 878139 - 2³ = 878131 is a prime.

It is a super-2 number, since 2×878139² = 1542256206642, which contains 22 as substring.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 878139.

It is not an unprimeable number, because it can be changed into a prime (878131) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 48777 + ... + 48794.

It is an arithmetic number, because the mean of its divisors is an integer number (211406).

2⁸⁷⁸¹³⁹ is an apocalyptic number.

878139 is a deficient number, since it is larger than the sum of its proper divisors (390297).

878139 is a wasteful number, since it uses less digits than its factorization.

878139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97577 (or 97574 counting only the distinct ones).

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

The square root of 878139 is about 937.0907106572. The cubic root of 878139 is about 95.7607977061.

The spelling of 878139 in words is "eight hundred seventy-eight thousand, one hundred thirty-nine".