865921393 has 2 divisors, whose sum is σ = 865921394. Its totient is φ = 865921392.

The previous prime is 865921369. The next prime is 865921477. The reversal of 865921393 is 393129568.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 452327824 + 413593569 = 21268^2 + 20337^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-865921393 is a prime.

It is not a weakly prime, because it can be changed into another prime (865921093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432960696 + 432960697.

It is an arithmetic number, because the mean of its divisors is an integer number (432960697).

Almost surely, 2^865921393 is an apocalyptic number.

It is an amenable number.

865921393 is a deficient number, since it is larger than the sum of its proper divisors (1).

865921393 is an equidigital number, since it uses as much as digits as its factorization.

865921393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 349920, while the sum is 46.

The square root of 865921393 is about 29426.5423215165. The cubic root of 865921393 is about 953.1461319088.

The spelling of 865921393 in words is "eight hundred sixty-five million, nine hundred twenty-one thousand, three hundred ninety-three".