1165855 has 8 divisors (see below), whose sum is σ = 1404864. Its totient is φ = 928800.

The previous prime is 1165849. The next prime is 1165861. The reversal of 1165855 is 5585611.

It is an interprime number because it is at equal distance from previous prime (1165849) and next prime (1165861).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1165855 - 2⁵ = 1165823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1885 + ... + 2425.

It is an arithmetic number, because the mean of its divisors is an integer number (175608).

2^1165855 is an apocalyptic number.

1165855 is a deficient number, since it is larger than the sum of its proper divisors (239009).

1165855 is an equidigital number, since it uses as much as digits as its factorization.

1165855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 977.

The product of its digits is 6000, while the sum is 31.

The square root of 1165855 is about 1079.7476557048. The cubic root of 1165855 is about 105.2482410661.

The spelling of 1165855 in words is "one million, one hundred sixty-five thousand, eight hundred fifty-five".