1216040456 has 8 divisors (see below), whose sum is σ = 2280075870. Its totient is φ = 608020224.

The previous prime is 1216040453. The next prime is 1216040467. The reversal of 1216040456 is 6540406121.

It can be written as a sum of positive squares in only one way, i.e., 1117832356 + 98208100 = 33434^2 + 9910^2 .

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

It is not an unprimeable number, because it can be changed into a prime (1216040453) 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 as a sum of consecutive naturals, namely, 76002521 + ... + 76002536.

Almost surely, 2^1216040456 is an apocalyptic number.

It is an amenable number.

1216040456 is a deficient number, since it is larger than the sum of its proper divisors (1064035414).

1216040456 is a wasteful number, since it uses less digits than its factorization.

1216040456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152005063 (or 152005059 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 1216040456 is about 34871.7716211838. The cubic root of 1216040456 is about 1067.3724962936.

Adding to 1216040456 its reverse (6540406121), we get a palindrome (7756446577).

The spelling of 1216040456 in words is "one billion, two hundred sixteen million, forty thousand, four hundred fifty-six".