1216299312 has 60 divisors (see below), whose sum is σ = 3412204224. Its totient is φ = 404449920.

The previous prime is 1216299277. The next prime is 1216299319. The reversal of 1216299312 is 2139926121.

1216299312 is a `hidden beast` number, since 1 + 21 + 629 + 9 + 3 + 1 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (1216299319) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 50593 + ... + 70655.

Almost surely, 2^1216299312 is an apocalyptic number.

1216299312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1216299312 is an abundant number, since it is smaller than the sum of its proper divisors (2195904912).

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

1216299312 is a wasteful number, since it uses less digits than its factorization.

1216299312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20498 (or 20489 counting only the distinct ones).

The product of its digits is 11664, while the sum is 36.

The square root of 1216299312 is about 34875.4829643978. The cubic root of 1216299312 is about 1067.4482273739.

The spelling of 1216299312 in words is "one billion, two hundred sixteen million, two hundred ninety-nine thousand, three hundred twelve".