1166643 has 12 divisors (see below), whose sum is σ = 1747928. Its totient is φ = 777600.

The previous prime is 1166639. The next prime is 1166663. The reversal of 1166643 is 3466611.

It is not a de Polignac number, because 1166643 - 2² = 1166639 is a prime.

It is a super-2 number, since 2×1166643² = 2722111778898, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1166603) 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 11 ways as a sum of consecutive naturals, for example, 2158 + ... + 2643.

2^1166643 is an apocalyptic number.

1166643 is a deficient number, since it is larger than the sum of its proper divisors (581285).

1166643 is an frugal number, since it uses more digits than its factorization.

1166643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4816 (or 4804 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 1166643 is about 1080.1124941412. The cubic root of 1166643 is about 105.2719481124.

Subtracting 1166643 from its reverse (3466611), we obtain a cube (2299968 = 132³).

The spelling of 1166643 in words is "one million, one hundred sixty-six thousand, six hundred forty-three".