855638023 has 2 divisors, whose sum is σ = 855638024. Its totient is φ = 855638022.

The previous prime is 855637957. The next prime is 855638053. The reversal of 855638023 is 320836558.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 855638023 - 2⁹ = 855637511 is a prime.

It is a zygodrome in base 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (855638053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 427819011 + 427819012.

It is an arithmetic number, because the mean of its divisors is an integer number (427819012).

Almost surely, 2^855638023 is an apocalyptic number.

855638023 is a deficient number, since it is larger than the sum of its proper divisors (1).

855638023 is an equidigital number, since it uses as much as digits as its factorization.

855638023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 172800, while the sum is 40.

The square root of 855638023 is about 29251.2909629644. The cubic root of 855638023 is about 949.3580235211.

The spelling of 855638023 in words is "eight hundred fifty-five million, six hundred thirty-eight thousand, twenty-three".