865829819 has 2 divisors, whose sum is σ = 865829820. Its totient is φ = 865829818.

The previous prime is 865829813. The next prime is 865829879. The reversal of 865829819 is 918928568.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 865829819 - 2⁴ = 865829803 is a prime.

It is a super-2 number, since 2×865829819² = 1499322550939145522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (865829813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432914909 + 432914910.

It is an arithmetic number, because the mean of its divisors is an integer number (432914910).

Almost surely, 2^865829819 is an apocalyptic number.

865829819 is a deficient number, since it is larger than the sum of its proper divisors (1).

865829819 is an equidigital number, since it uses as much as digits as its factorization.

865829819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2488320, while the sum is 56.

The square root of 865829819 is about 29424.9863041599. The cubic root of 865829819 is about 953.1125312912.

The spelling of 865829819 in words is "eight hundred sixty-five million, eight hundred twenty-nine thousand, eight hundred nineteen".