855439563 has 32 divisors (see below), whose sum is σ = 1259419392. Its totient is φ = 512179200.

The previous prime is 855439553. The next prime is 855439567. The reversal of 855439563 is 365934558.

It is not a de Polignac number, because 855439563 - 2¹⁶ = 855374027 is a prime.

It is not an unprimeable number, because it can be changed into a prime (855439567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1871631 + ... + 1872087.

It is an arithmetic number, because the mean of its divisors is an integer number (39356856).

Almost surely, 2^855439563 is an apocalyptic number.

855439563 is a deficient number, since it is larger than the sum of its proper divisors (403979829).

855439563 is a wasteful number, since it uses less digits than its factorization.

855439563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1035.

The product of its digits is 1944000, while the sum is 48.

The square root of 855439563 is about 29247.8984373237. The cubic root of 855439563 is about 949.2846185854.

The spelling of 855439563 in words is "eight hundred fifty-five million, four hundred thirty-nine thousand, five hundred sixty-three".