865804011 has 32 divisors (see below), whose sum is σ = 1216250112. Its totient is φ = 547223040.

The previous prime is 865804007. The next prime is 865804057. The reversal of 865804011 is 110408568.

It is not a de Polignac number, because 865804011 - 2² = 865804007 is a prime.

It is not an unprimeable number, because it can be changed into a prime (865804811) 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 in 31 ways as a sum of consecutive naturals, for example, 1655196 + ... + 1655718.

It is an arithmetic number, because the mean of its divisors is an integer number (38007816).

Almost surely, 2^865804011 is an apocalyptic number.

865804011 is a deficient number, since it is larger than the sum of its proper divisors (350446101).

865804011 is a wasteful number, since it uses less digits than its factorization.

865804011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 923.

The product of its (nonzero) digits is 7680, while the sum is 33.

The square root of 865804011 is about 29424.5477620303. The cubic root of 865804011 is about 953.1030613114.

The spelling of 865804011 in words is "eight hundred sixty-five million, eight hundred four thousand, eleven".