1216443326 has 16 divisors (see below), whose sum is σ = 2127890400. Its totient is φ = 521332560.

The previous prime is 1216443259. The next prime is 1216443329. The reversal of 1216443326 is 6233446121.

It is a junction number, because it is equal to n+sod(n) for n = 1216443292 and 1216443301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216443329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 885935 + ... + 887306.

It is an arithmetic number, because the mean of its divisors is an integer number (132993150).

Almost surely, 2^1216443326 is an apocalyptic number.

1216443326 is a deficient number, since it is larger than the sum of its proper divisors (911447074).

1216443326 is an equidigital number, since it uses as much as digits as its factorization.

1216443326 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1773264 (or 1773250 counting only the distinct ones).

The product of its digits is 20736, while the sum is 32.

The square root of 1216443326 is about 34877.5475915380. The cubic root of 1216443326 is about 1067.4903555520.

Adding to 1216443326 its reverse (6233446121), we get a palindrome (7449889447).

The spelling of 1216443326 in words is "one billion, two hundred sixteen million, four hundred forty-three thousand, three hundred twenty-six".