878239 has 2 divisors, whose sum is σ = 878240. Its totient is φ = 878238.

The previous prime is 878221. The next prime is 878279. The reversal of 878239 is 932878.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 878239 - 2¹¹ = 876191 is a prime.

It is a super-2 number, since 2×878239² = 1542607482242, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 878198 and 878207.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (878279) 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 as a sum of consecutive naturals, namely, 439119 + 439120.

It is an arithmetic number, because the mean of its divisors is an integer number (439120).

2⁸⁷⁸²³⁹ is an apocalyptic number.

878239 is a deficient number, since it is larger than the sum of its proper divisors (1).

878239 is an equidigital number, since it uses as much as digits as its factorization.

878239 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 37.

The square root of 878239 is about 937.1440657658. The cubic root of 878239 is about 95.7644325582.

The spelling of 878239 in words is "eight hundred seventy-eight thousand, two hundred thirty-nine".