1166989 has 4 divisors (see below), whose sum is σ = 1207260. Its totient is φ = 1126720.

The previous prime is 1166987. The next prime is 1167011. The reversal of 1166989 is 9896611.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 311364 + 855625 = 558^2 + 925^2 .

It is a cyclic number.

It is not a de Polignac number, because 1166989 - 2¹ = 1166987 is a prime.

It is a super-2 number, since 2×1166989² = 2723726652242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1166987) 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 3 ways as a sum of consecutive naturals, for example, 20092 + ... + 20149.

It is an arithmetic number, because the mean of its divisors is an integer number (301815).

2^1166989 is an apocalyptic number.

It is an amenable number.

1166989 is a deficient number, since it is larger than the sum of its proper divisors (40271).

1166989 is an equidigital number, since it uses as much as digits as its factorization.

1166989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40270.

The product of its digits is 23328, while the sum is 40.

The square root of 1166989 is about 1080.2726507692. The cubic root of 1166989 is about 105.2823541789.

The spelling of 1166989 in words is "one million, one hundred sixty-six thousand, nine hundred eighty-nine".