864215239 has 2 divisors, whose sum is σ = 864215240. Its totient is φ = 864215238.

The previous prime is 864215221. The next prime is 864215251. The reversal of 864215239 is 932512468.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 864215239 - 2¹⁷ = 864084167 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (864215279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432107619 + 432107620.

It is an arithmetic number, because the mean of its divisors is an integer number (432107620).

Almost surely, 2^864215239 is an apocalyptic number.

864215239 is a deficient number, since it is larger than the sum of its proper divisors (1).

864215239 is an equidigital number, since it uses as much as digits as its factorization.

864215239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 103680, while the sum is 40.

The square root of 864215239 is about 29397.5379751434. The cubic root of 864215239 is about 952.5197150343.

The spelling of 864215239 in words is "eight hundred sixty-four million, two hundred fifteen thousand, two hundred thirty-nine".