1216440136 has 8 divisors (see below), whose sum is σ = 2280825270. Its totient is φ = 608220064.

The previous prime is 1216440133. The next prime is 1216440143. The reversal of 1216440136 is 6310446121.

It can be written as a sum of positive squares in only one way, i.e., 991620100 + 224820036 = 31490^2 + 14994^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1216440133) 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 as a sum of consecutive naturals, namely, 76027501 + ... + 76027516.

Almost surely, 2^1216440136 is an apocalyptic number.

It is an amenable number.

1216440136 is a deficient number, since it is larger than the sum of its proper divisors (1064385134).

1216440136 is a wasteful number, since it uses less digits than its factorization.

1216440136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152055023 (or 152055019 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 1216440136 is about 34877.5018600817. The cubic root of 1216440136 is about 1067.4894224226.

Adding to 1216440136 its reverse (6310446121), we get a palindrome (7526886257).

The spelling of 1216440136 in words is "one billion, two hundred sixteen million, four hundred forty thousand, one hundred thirty-six".