1216535232 has 224 divisors, whose sum is σ = 3841357824. Its totient is φ = 335462400.

The previous prime is 1216535207. The next prime is 1216535237. The reversal of 1216535232 is 2325356121.

It is a self number, because there is not a number n which added to its sum of digits gives 1216535232.

It is not an unprimeable number, because it can be changed into a prime (1216535237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1112478 + ... + 1113570.

Almost surely, 2^1216535232 is an apocalyptic number.

1216535232 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1216535232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1920678912).

1216535232 is an abundant number, since it is smaller than the sum of its proper divisors (2624822592).

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

1216535232 is a wasteful number, since it uses less digits than its factorization.

1216535232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1167 (or 1157 counting only the distinct ones).

The product of its digits is 10800, while the sum is 30.

The square root of 1216535232 is about 34878.8651191520. The cubic root of 1216535232 is about 1067.5172389247.

The spelling of 1216535232 in words is "one billion, two hundred sixteen million, five hundred thirty-five thousand, two hundred thirty-two".