865829879 has 2 divisors, whose sum is σ = 865829880. Its totient is φ = 865829878.

The previous prime is 865829819. The next prime is 865829893. The reversal of 865829879 is 978928568.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 865829879 - 2¹⁶ = 865764343 is a prime.

It is a super-2 number, since 2×865829879² = 1499322758738309282, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (865829819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432914939 + 432914940.

It is an arithmetic number, because the mean of its divisors is an integer number (432914940).

Almost surely, 2^865829879 is an apocalyptic number.

865829879 is a deficient number, since it is larger than the sum of its proper divisors (1).

865829879 is an equidigital number, since it uses as much as digits as its factorization.

865829879 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17418240, while the sum is 62.

The square root of 865829879 is about 29424.9873237016. The cubic root of 865829879 is about 953.1125533073.

The spelling of 865829879 in words is "eight hundred sixty-five million, eight hundred twenty-nine thousand, eight hundred seventy-nine".