1217972894424 has 128 divisors (see below), whose sum is σ = 3614143034880. Its totient is φ = 337179340800.

The previous prime is 1217972894387. The next prime is 1217972894447. The reversal of 1217972894424 is 4244982797121.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1496412 + ... + 2162219.

It is an arithmetic number, because the mean of its divisors is an integer number (28235492460).

Almost surely, 2^{1217972894424} is an apocalyptic number.

It is an amenable number.

1217972894424 is an abundant number, since it is smaller than the sum of its proper divisors (2396170140456).

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

1217972894424 is a wasteful number, since it uses less digits than its factorization.

1217972894424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3658761 (or 3658757 counting only the distinct ones).

The product of its digits is 16257024, while the sum is 60.

The spelling of 1217972894424 in words is "one trillion, two hundred seventeen billion, nine hundred seventy-two million, eight hundred ninety-four thousand, four hundred twenty-four".