1155855 has 16 divisors (see below), whose sum is σ = 1862784. Its totient is φ = 612000.

The previous prime is 1155851. The next prime is 1155859. The reversal of 1155855 is 5585511.

It is an interprime number because it is at equal distance from previous prime (1155851) and next prime (1155859).

It is not a de Polignac number, because 1155855 - 2² = 1155851 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155851) 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, 3612 + ... + 3918.

It is an arithmetic number, because the mean of its divisors is an integer number (116424).

2^1155855 is an apocalyptic number.

1155855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1155855 is a deficient number, since it is larger than the sum of its proper divisors (706929).

1155855 is a wasteful number, since it uses less digits than its factorization.

1155855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 566.

The product of its digits is 5000, while the sum is 30.

The square root of 1155855 is about 1075.1069714219. The cubic root of 1155855 is about 104.9464579630.

The spelling of 1155855 in words is "one million, one hundred fifty-five thousand, eight hundred fifty-five".