863879 has 2 divisors, whose sum is σ = 863880. Its totient is φ = 863878.

The previous prime is 863869. The next prime is 863887. The reversal of 863879 is 978368.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 863879 - 2¹² = 859783 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (863869) 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, 431939 + 431940.

It is an arithmetic number, because the mean of its divisors is an integer number (431940).

2⁸⁶³⁸⁷⁹ is an apocalyptic number.

863879 is a deficient number, since it is larger than the sum of its proper divisors (1).

863879 is an equidigital number, since it uses as much as digits as its factorization.

863879 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 41.

The square root of 863879 is about 929.4509131740. The cubic root of 863879 is about 95.2396167178.

The spelling of 863879 in words is "eight hundred sixty-three thousand, eight hundred seventy-nine".