1165005 has 12 divisors (see below), whose sum is σ = 2019420. Its totient is φ = 621312.

The previous prime is 1165001. The next prime is 1165037. The reversal of 1165005 is 5005611.

1165005 is a `hidden beast` number, since 11 + 650 + 0 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 826281 + 338724 = 909^2 + 582^2 .

It is not a de Polignac number, because 1165005 - 2² = 1165001 is a prime.

1165005 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1165001) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 12900 + ... + 12989.

It is an arithmetic number, because the mean of its divisors is an integer number (168285).

2^1165005 is an apocalyptic number.

1165005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1165005 is a deficient number, since it is larger than the sum of its proper divisors (854415).

1165005 is a wasteful number, since it uses less digits than its factorization.

1165005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25900 (or 25897 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 18.

The square root of 1165005 is about 1079.3539734489. The cubic root of 1165005 is about 105.2226567652. Note that the first 3 decimals are identical.

Subtracting 1165005 from its reverse (5005611), we obtain a triangular number (3840606 = T₂₇₇₁).

The spelling of 1165005 in words is "one million, one hundred sixty-five thousand, five".