1216430536 has 32 divisors (see below), whose sum is σ = 2332638360. Its totient is φ = 594542592.

The previous prime is 1216430531. The next prime is 1216430543. The reversal of 1216430536 is 6350346121.

It can be written as a sum of positive squares in 4 ways, for example, as 766736100 + 449694436 = 27690^2 + 21206^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1216430498 and 1216430507.

It is not an unprimeable number, because it can be changed into a prime (1216430531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56776 + ... + 75208.

Almost surely, 2^1216430536 is an apocalyptic number.

It is an amenable number.

1216430536 is a deficient number, since it is larger than the sum of its proper divisors (1116207824).

1216430536 is a wasteful number, since it uses less digits than its factorization.

1216430536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18625 (or 18621 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 1216430536 is about 34877.3642352744. The cubic root of 1216430536 is about 1067.4866142489.

Adding to 1216430536 its reverse (6350346121), we get a palindrome (7566776657).

The spelling of 1216430536 in words is "one billion, two hundred sixteen million, four hundred thirty thousand, five hundred thirty-six".