1216329684 has 24 divisors (see below), whose sum is σ = 2878077888. Its totient is φ = 399732480.

The previous prime is 1216329679. The next prime is 1216329689. The reversal of 1216329684 is 4869236121.

It is an interprime number because it is at equal distance from previous prime (1216329679) and next prime (1216329689).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216329689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 712957 + ... + 714660.

It is an arithmetic number, because the mean of its divisors is an integer number (119919912).

Almost surely, 2^1216329684 is an apocalyptic number.

It is an amenable number.

1216329684 is an abundant number, since it is smaller than the sum of its proper divisors (1661748204).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1216329684 is a wasteful number, since it uses less digits than its factorization.

1216329684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1427695 (or 1427693 counting only the distinct ones).

The product of its digits is 124416, while the sum is 42.

The square root of 1216329684 is about 34875.9183965096. The cubic root of 1216329684 is about 1067.4571123217.

The spelling of 1216329684 in words is "one billion, two hundred sixteen million, three hundred twenty-nine thousand, six hundred eighty-four".