1166789 has 4 divisors (see below), whose sum is σ = 1256556. Its totient is φ = 1077024.

The previous prime is 1166779. The next prime is 1166801. The reversal of 1166789 is 9876611.

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 550564 + 616225 = 742^2 + 785^2 .

It is not a de Polignac number, because 1166789 - 2⁴ = 1166773 is a prime.

It is a super-2 number, since 2×1166789² = 2722793141042, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1166729) 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, 44864 + ... + 44889.

It is an arithmetic number, because the mean of its divisors is an integer number (314139).

2^1166789 is an apocalyptic number.

It is an amenable number.

1166789 is a deficient number, since it is larger than the sum of its proper divisors (89767).

1166789 is an equidigital number, since it uses as much as digits as its factorization.

1166789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89766.

The product of its digits is 18144, while the sum is 38.

The square root of 1166789 is about 1080.1800775797. The cubic root of 1166789 is about 105.2763393625.

The spelling of 1166789 in words is "one million, one hundred sixty-six thousand, seven hundred eighty-nine".