1216329806 has 8 divisors (see below), whose sum is σ = 1826714064. Its totient is φ = 607425120.

The previous prime is 1216329799. The next prime is 1216329839. The reversal of 1216329806 is 6089236121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1216329806.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 367835 + ... + 371126.

It is an arithmetic number, because the mean of its divisors is an integer number (228339258).

Almost surely, 2^1216329806 is an apocalyptic number.

1216329806 is a deficient number, since it is larger than the sum of its proper divisors (610384258).

1216329806 is an equidigital number, since it uses as much as digits as its factorization.

1216329806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 739786.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 1216329806 is about 34875.9201455675. The cubic root of 1216329806 is about 1067.4571480110.

The spelling of 1216329806 in words is "one billion, two hundred sixteen million, three hundred twenty-nine thousand, eight hundred six".