1165665 has 8 divisors (see below), whose sum is σ = 1865088. Its totient is φ = 621680.

The previous prime is 1165643. The next prime is 1165667. The reversal of 1165665 is 5665611.

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

It is not a de Polignac number, because 1165665 - 2¹⁰ = 1164641 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1165667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38841 + ... + 38870.

It is an arithmetic number, because the mean of its divisors is an integer number (233136).

2^1165665 is an apocalyptic number.

1165665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1165665 is a deficient number, since it is larger than the sum of its proper divisors (699423).

1165665 is an equidigital number, since it uses as much as digits as its factorization.

1165665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77719.

The product of its digits is 5400, while the sum is 30.

The square root of 1165665 is about 1079.6596685993. The cubic root of 1165665 is about 105.2425233018.

It can be divided in two parts, 1165 and 665, that added together give a triangular number (1830 = T₆₀).

The spelling of 1165665 in words is "one million, one hundred sixty-five thousand, six hundred sixty-five".