865222387 has 2 divisors, whose sum is σ = 865222388. Its totient is φ = 865222386.

The previous prime is 865222343. The next prime is 865222427. The reversal of 865222387 is 783222568.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 865222387 - 2¹¹ = 865220339 is a prime.

It is not a weakly prime, because it can be changed into another prime (865222187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432611193 + 432611194.

It is an arithmetic number, because the mean of its divisors is an integer number (432611194).

Almost surely, 2^865222387 is an apocalyptic number.

865222387 is a deficient number, since it is larger than the sum of its proper divisors (1).

865222387 is an equidigital number, since it uses as much as digits as its factorization.

865222387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 322560, while the sum is 43.

The square root of 865222387 is about 29414.6627891601. The cubic root of 865222387 is about 952.8895904465.

The spelling of 865222387 in words is "eight hundred sixty-five million, two hundred twenty-two thousand, three hundred eighty-seven".