878023 has 2 divisors, whose sum is σ = 878024. Its totient is φ = 878022.

The previous prime is 878021. The next prime is 878039. The reversal of 878023 is 320878.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 878023 - 2¹ = 878021 is a prime.

Together with 878021, it forms a pair of twin primes.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 877982 and 878000.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (878021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 439011 + 439012.

It is an arithmetic number, because the mean of its divisors is an integer number (439012).

2⁸⁷⁸⁰²³ is an apocalyptic number.

878023 is a deficient number, since it is larger than the sum of its proper divisors (1).

878023 is an equidigital number, since it uses as much as digits as its factorization.

878023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 878023 is about 937.0288149251. The cubic root of 878023 is about 95.7565809319.

The spelling of 878023 in words is "eight hundred seventy-eight thousand, twenty-three".