1216506326 has 64 divisors (see below), whose sum is σ = 2233889280. Its totient is φ = 485802240.

The previous prime is 1216506301. The next prime is 1216506353. The reversal of 1216506326 is 6236056121.

It is a junction number, because it is equal to n+sod(n) for n = 1216506292 and 1216506301.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1780781 + ... + 1781463.

It is an arithmetic number, because the mean of its divisors is an integer number (34904520).

Almost surely, 2^1216506326 is an apocalyptic number.

1216506326 is a deficient number, since it is larger than the sum of its proper divisors (1017382954).

1216506326 is a wasteful number, since it uses less digits than its factorization.

1216506326 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 869.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 1216506326 is about 34878.4507396759. The cubic root of 1216506326 is about 1067.5087837928.

The spelling of 1216506326 in words is "one billion, two hundred sixteen million, five hundred six thousand, three hundred twenty-six".