869879 has 2 divisors, whose sum is σ = 869880. Its totient is φ = 869878.

The previous prime is 869863. The next prime is 869887. The reversal of 869879 is 978968.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 869879 - 2⁴ = 869863 is a prime.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 869879.

It is not a weakly prime, because it can be changed into another prime (869809) 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, 434939 + 434940.

It is an arithmetic number, because the mean of its divisors is an integer number (434940).

2⁸⁶⁹⁸⁷⁹ is an apocalyptic number.

869879 is a deficient number, since it is larger than the sum of its proper divisors (1).

869879 is an equidigital number, since it uses as much as digits as its factorization.

869879 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 47.

The square root of 869879 is about 932.6730402451. The cubic root of 869879 is about 95.4596011615.

The spelling of 869879 in words is "eight hundred sixty-nine thousand, eight hundred seventy-nine".