1156665 has 16 divisors (see below), whose sum is σ = 1915200. Its totient is φ = 595392.

The previous prime is 1156643. The next prime is 1156681. The reversal of 1156665 is 5666511.

It is not a de Polignac number, because 1156665 - 2⁵ = 1156633 is a prime.

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, 895 + ... + 1764.

It is an arithmetic number, because the mean of its divisors is an integer number (119700).

2^1156665 is an apocalyptic number.

1156665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1156665 is a deficient number, since it is larger than the sum of its proper divisors (758535).

1156665 is a wasteful number, since it uses less digits than its factorization.

1156665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2696.

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

The square root of 1156665 is about 1075.4836121485. The cubic root of 1156665 is about 104.9709670297.

The spelling of 1156665 in words is "one million, one hundred fifty-six thousand, six hundred sixty-five".