1166689 has 4 divisors (see below), whose sum is σ = 1188756. Its totient is φ = 1144624.

The previous prime is 1166687. The next prime is 1166713. The reversal of 1166689 is 9866611.

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 824464 + 342225 = 908^2 + 585^2 .

It is a cyclic number.

It is not a de Polignac number, because 1166689 - 2¹ = 1166687 is a prime.

It is a super-2 number, since 2×1166689² = 2722326445442, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (1166687) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10954 + ... + 11059.

It is an arithmetic number, because the mean of its divisors is an integer number (297189).

2^1166689 is an apocalyptic number.

It is an amenable number.

1166689 is a deficient number, since it is larger than the sum of its proper divisors (22067).

1166689 is an equidigital number, since it uses as much as digits as its factorization.

1166689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22066.

The product of its digits is 15552, while the sum is 37.

The square root of 1166689 is about 1080.1337880096. The cubic root of 1166689 is about 105.2733316965.

The spelling of 1166689 in words is "one million, one hundred sixty-six thousand, six hundred eighty-nine".