855138585 has 32 divisors (see below), whose sum is σ = 1571657472. Its totient is φ = 388926720.

The previous prime is 855138577. The next prime is 855138589. The reversal of 855138585 is 585831558.

It is a happy number.

It is not a de Polignac number, because 855138585 - 2³ = 855138577 is a prime.

It is not an unprimeable number, because it can be changed into a prime (855138589) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15 + ... + 41355.

It is an arithmetic number, because the mean of its divisors is an integer number (49114296).

Almost surely, 2^855138585 is an apocalyptic number.

It is an amenable number.

855138585 is a deficient number, since it is larger than the sum of its proper divisors (716518887).

855138585 is a wasteful number, since it uses less digits than its factorization.

855138585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41553.

The product of its digits is 960000, while the sum is 48.

The square root of 855138585 is about 29242.7526919064. The cubic root of 855138585 is about 949.1732733724.

The spelling of 855138585 in words is "eight hundred fifty-five million, one hundred thirty-eight thousand, five hundred eighty-five".