1242166 has 4 divisors (see below), whose sum is σ = 1863252. Its totient is φ = 621082.

The previous prime is 1242151. The next prime is 1242167. The reversal of 1242166 is 6612421.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242167) 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, 310540 + ... + 310543.

It is an arithmetic number, because the mean of its divisors is an integer number (465813).

2^1242166 is an apocalyptic number.

1242166 is a deficient number, since it is larger than the sum of its proper divisors (621086).

1242166 is an equidigital number, since it uses as much as digits as its factorization.

1242166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621085.

The product of its digits is 576, while the sum is 22.

The square root of 1242166 is about 1114.5250109352. The cubic root of 1242166 is about 107.4962248539.

Adding to 1242166 its reverse (6612421), we get a palindrome (7854587).

The spelling of 1242166 in words is "one million, two hundred forty-two thousand, one hundred sixty-six".