870823 has 2 divisors, whose sum is σ = 870824. Its totient is φ = 870822.

The previous prime is 870811. The next prime is 870833. The reversal of 870823 is 328078.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 870823 - 2¹⁷ = 739751 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 870791 and 870800.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (870833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 435411 + 435412.

It is an arithmetic number, because the mean of its divisors is an integer number (435412).

2⁸⁷⁰⁸²³ is an apocalyptic number.

870823 is a deficient number, since it is larger than the sum of its proper divisors (1).

870823 is an equidigital number, since it uses as much as digits as its factorization.

870823 is an odious number, because the sum of its binary digits is odd.

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

The square root of 870823 is about 933.1789753311. The cubic root of 870823 is about 95.4941198649.

The spelling of 870823 in words is "eight hundred seventy thousand, eight hundred twenty-three".