855897239 has 2 divisors, whose sum is σ = 855897240. Its totient is φ = 855897238.

The previous prime is 855897233. The next prime is 855897253. The reversal of 855897239 is 932798558.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 855897239 - 2²⁰ = 854848663 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (855897233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 427948619 + 427948620.

It is an arithmetic number, because the mean of its divisors is an integer number (427948620).

Almost surely, 2^855897239 is an apocalyptic number.

855897239 is a deficient number, since it is larger than the sum of its proper divisors (1).

855897239 is an equidigital number, since it uses as much as digits as its factorization.

855897239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5443200, while the sum is 56.

The square root of 855897239 is about 29255.7214746107. The cubic root of 855897239 is about 949.4538833497.

The spelling of 855897239 in words is "eight hundred fifty-five million, eight hundred ninety-seven thousand, two hundred thirty-nine".