865006399 has 2 divisors, whose sum is σ = 865006400. Its totient is φ = 865006398.

The previous prime is 865006367. The next prime is 865006411. The reversal of 865006399 is 993600568.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 865006399 - 2⁵ = 865006367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (865006349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432503199 + 432503200.

It is an arithmetic number, because the mean of its divisors is an integer number (432503200).

Almost surely, 2^865006399 is an apocalyptic number.

865006399 is a deficient number, since it is larger than the sum of its proper divisors (1).

865006399 is an equidigital number, since it uses as much as digits as its factorization.

865006399 is an evil number, because the sum of its binary digits is even.

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

The square root of 865006399 is about 29410.9911257679. The cubic root of 865006399 is about 952.8102929740.

The spelling of 865006399 in words is "eight hundred sixty-five million, six thousand, three hundred ninety-nine".