855639727 has 2 divisors, whose sum is σ = 855639728. Its totient is φ = 855639726.

The previous prime is 855639713. The next prime is 855639737. The reversal of 855639727 is 727936558.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 855639727 - 2²⁷ = 721421999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (855639737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 427819863 + 427819864.

It is an arithmetic number, because the mean of its divisors is an integer number (427819864).

Almost surely, 2^855639727 is an apocalyptic number.

855639727 is a deficient number, since it is larger than the sum of its proper divisors (1).

855639727 is an equidigital number, since it uses as much as digits as its factorization.

855639727 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3175200, while the sum is 52.

The square root of 855639727 is about 29251.3200898694. The cubic root of 855639727 is about 949.3586537350.

The spelling of 855639727 in words is "eight hundred fifty-five million, six hundred thirty-nine thousand, seven hundred twenty-seven".