855915 has 16 divisors (see below), whose sum is σ = 1402368. Its totient is φ = 445536.

The previous prime is 855901. The next prime is 855919. The reversal of 855915 is 519558.

It is not a de Polignac number, because 855915 - 2⁶ = 855851 is a prime.

It is not an unprimeable number, because it can be changed into a prime (855919) 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, 19 + ... + 1308.

It is an arithmetic number, because the mean of its divisors is an integer number (87648).

2⁸⁵⁵⁹¹⁵ is an apocalyptic number.

855915 is a deficient number, since it is larger than the sum of its proper divisors (546453).

855915 is a wasteful number, since it uses less digits than its factorization.

855915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1378.

The product of its digits is 9000, while the sum is 33.

The square root of 855915 is about 925.1567434765. The cubic root of 855915 is about 94.9460450779.

It can be divided in two parts, 855 and 915, that added together give a triangular number (1770 = T₅₉).

The spelling of 855915 in words is "eight hundred fifty-five thousand, nine hundred fifteen".