855819890 has 16 divisors (see below), whose sum is σ = 1549703232. Its totient is φ = 340277424.

The previous prime is 855819863. The next prime is 855819929. The reversal of 855819890 is 98918558.

It is a super-2 number, since 2×855819890² = 1464855368239224200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 254564 + ... + 257903.

It is an arithmetic number, because the mean of its divisors is an integer number (96856452).

Almost surely, 2^855819890 is an apocalyptic number.

855819890 is a deficient number, since it is larger than the sum of its proper divisors (693883342).

855819890 is a wasteful number, since it uses less digits than its factorization.

855819890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 512641.

The product of its (nonzero) digits is 1036800, while the sum is 53.

The square root of 855819890 is about 29254.3994981951. The cubic root of 855819890 is about 949.4252811930.

The spelling of 855819890 in words is "eight hundred fifty-five million, eight hundred nineteen thousand, eight hundred ninety".