1205855 has 16 divisors (see below), whose sum is σ = 1672704. Its totient is φ = 817440.

The previous prime is 1205843. The next prime is 1205891. The reversal of 1205855 is 5585021.

It is not a de Polignac number, because 1205855 - 2¹⁴ = 1189471 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4454 + ... + 4716.

It is an arithmetic number, because the mean of its divisors is an integer number (104544).

2^1205855 is an apocalyptic number.

1205855 is a deficient number, since it is larger than the sum of its proper divisors (466849).

1205855 is a wasteful number, since it uses less digits than its factorization.

1205855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406.

The product of its (nonzero) digits is 2000, while the sum is 26.

The square root of 1205855 is about 1098.1142927765. The cubic root of 1205855 is about 106.4384061985.

The spelling of 1205855 in words is "one million, two hundred five thousand, eight hundred fifty-five".