855145 has 4 divisors (see below), whose sum is σ = 1026180. Its totient is φ = 684112.

The previous prime is 855143. The next prime is 855187. The reversal of 855145 is 541558.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 341056 + 514089 = 584^2 + 717^2 .

It is a cyclic number.

It is not a de Polignac number, because 855145 - 2¹ = 855143 is a prime.

It is not an unprimeable number, because it can be changed into a prime (855143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85510 + ... + 85519.

It is an arithmetic number, because the mean of its divisors is an integer number (256545).

2⁸⁵⁵¹⁴⁵ is an apocalyptic number.

It is an amenable number.

855145 is a deficient number, since it is larger than the sum of its proper divisors (171035).

855145 is a wasteful number, since it uses less digits than its factorization.

855145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171034.

The product of its digits is 4000, while the sum is 28.

The square root of 855145 is about 924.7405041416. The cubic root of 855145 is about 94.9175646840.

It can be divided in two parts, 855 and 145, that added together give a cube (1000 = 10³).

The spelling of 855145 in words is "eight hundred fifty-five thousand, one hundred forty-five".