1166623 has 4 divisors (see below), whose sum is σ = 1204288. Its totient is φ = 1128960.

The previous prime is 1166617. The next prime is 1166639. The reversal of 1166623 is 3266611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3266611 = 61 ⋅53551.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1166623 is a prime.

It is a super-2 number, since 2×1166623² = 2722018448258, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1166603) 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, 18786 + ... + 18847.

It is an arithmetic number, because the mean of its divisors is an integer number (301072).

2^1166623 is an apocalyptic number.

1166623 is a deficient number, since it is larger than the sum of its proper divisors (37665).

1166623 is an equidigital number, since it uses as much as digits as its factorization.

1166623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37664.

The product of its digits is 1296, while the sum is 25.

The square root of 1166623 is about 1080.1032358067. The cubic root of 1166623 is about 105.2713465428.

The spelling of 1166623 in words is "one million, one hundred sixty-six thousand, six hundred twenty-three".