1243166 has 4 divisors (see below), whose sum is σ = 1864752. Its totient is φ = 621582.

The previous prime is 1243157. The next prime is 1243169. The reversal of 1243166 is 6613421.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6613421 = 29 ⋅228049.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243169) 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 as a sum of consecutive naturals, namely, 310790 + ... + 310793.

It is an arithmetic number, because the mean of its divisors is an integer number (466188).

2^1243166 is an apocalyptic number.

1243166 is a deficient number, since it is larger than the sum of its proper divisors (621586).

1243166 is an equidigital number, since it uses as much as digits as its factorization.

1243166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621585.

The product of its digits is 864, while the sum is 23.

The square root of 1243166 is about 1114.9735422870. The cubic root of 1243166 is about 107.5250635629.

Adding to 1243166 its reverse (6613421), we get a palindrome (7856587).

The spelling of 1243166 in words is "one million, two hundred forty-three thousand, one hundred sixty-six".