1216308132 has 72 divisors (see below), whose sum is σ = 3391872120. Its totient is φ = 365114880.

The previous prime is 1216308109. The next prime is 1216308139. The reversal of 1216308132 is 2318036121.

It is a happy number.

1216308132 is a `hidden beast` number, since 1 + 21 + 630 + 8 + 1 + 3 + 2 = 666.

1216308132 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 6937956 + 1209370176 = 2634^2 + 34776^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1216308096 and 1216308105.

It is not an unprimeable number, because it can be changed into a prime (1216308139) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12507 + ... + 50882.

It is an arithmetic number, because the mean of its divisors is an integer number (47109335).

Almost surely, 2^1216308132 is an apocalyptic number.

1216308132 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1216308132 is an abundant number, since it is smaller than the sum of its proper divisors (2175563988).

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

1216308132 is a wasteful number, since it uses less digits than its factorization.

1216308132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63453 (or 63448 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 1216308132 is about 34875.6094140303. The cubic root of 1216308132 is about 1067.4508075696.

The spelling of 1216308132 in words is "one billion, two hundred sixteen million, three hundred eight thousand, one hundred thirty-two".