1216426 has 4 divisors (see below), whose sum is σ = 1824642. Its totient is φ = 608212.

The previous prime is 1216421. The next prime is 1216433. The reversal of 1216426 is 6246121.

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

It can be written as a sum of positive squares in only one way, i.e., 1212201 + 4225 = 1101^2 + 65^2 .

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 junction number, because it is equal to n+sod(n) for n = 1216397 and 1216406.

It is not an unprimeable number, because it can be changed into a prime (1216421) 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, 304105 + ... + 304108.

2^1216426 is an apocalyptic number.

1216426 is a deficient number, since it is larger than the sum of its proper divisors (608216).

1216426 is an equidigital number, since it uses as much as digits as its factorization.

1216426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 608215.

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

The square root of 1216426 is about 1102.9170413046. The cubic root of 1216426 is about 106.7485287382.

The spelling of 1216426 in words is "one million, two hundred sixteen thousand, four hundred twenty-six".