855800139 has 16 divisors (see below), whose sum is σ = 1150562304. Its totient is φ = 565804800.

The previous prime is 855800137. The next prime is 855800149. The reversal of 855800139 is 931008558.

It is not a de Polignac number, because 855800139 - 2¹ = 855800137 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 855800097 and 855800106.

It is not an unprimeable number, because it can be changed into a prime (855800131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 200154 + ... + 204384.

It is an arithmetic number, because the mean of its divisors is an integer number (71910144).

Almost surely, 2^855800139 is an apocalyptic number.

855800139 is a deficient number, since it is larger than the sum of its proper divisors (294762165).

855800139 is a wasteful number, since it uses less digits than its factorization.

855800139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4778.

The product of its (nonzero) digits is 43200, while the sum is 39.

The square root of 855800139 is about 29254.0619230903. The cubic root of 855800139 is about 949.4179773809.

The spelling of 855800139 in words is "eight hundred fifty-five million, eight hundred thousand, one hundred thirty-nine".