865043 has 2 divisors, whose sum is σ = 865044. Its totient is φ = 865042.

The previous prime is 865003. The next prime is 865049. The reversal of 865043 is 340568.

865043 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 865043 - 2⁶ = 864979 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (865049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432521 + 432522.

It is an arithmetic number, because the mean of its divisors is an integer number (432522).

2⁸⁶⁵⁰⁴³ is an apocalyptic number.

865043 is a deficient number, since it is larger than the sum of its proper divisors (1).

865043 is an equidigital number, since it uses as much as digits as its factorization.

865043 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 865043 is about 930.0768785428. The cubic root of 865043 is about 95.2823731533.

The spelling of 865043 in words is "eight hundred sixty-five thousand, forty-three".