865829863 has 4 divisors (see below), whose sum is σ = 867886888. Its totient is φ = 863772840.

The previous prime is 865829819. The next prime is 865829879. The reversal of 865829863 is 368928568.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-865829863 is a prime.

It is a super-2 number, since 2×865829863² = 1499322703325197538, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (865829803) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1027881 + ... + 1028722.

It is an arithmetic number, because the mean of its divisors is an integer number (216971722).

Almost surely, 2^865829863 is an apocalyptic number.

865829863 is a deficient number, since it is larger than the sum of its proper divisors (2057025).

865829863 is a wasteful number, since it uses less digits than its factorization.

865829863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2057024.

The product of its digits is 4976640, while the sum is 55.

The square root of 865829863 is about 29424.9870518238. The cubic root of 865829863 is about 953.1125474363.

The spelling of 865829863 in words is "eight hundred sixty-five million, eight hundred twenty-nine thousand, eight hundred sixty-three".