1217145984 has 64 divisors (see below), whose sum is σ = 3236868000. Its totient is φ = 405235712.

The previous prime is 1217145983. The next prime is 1217146001. The reversal of 1217145984 is 4895417121.

It is a tau number, because it is divible by the number of its divisors (64).

It is not an unprimeable number, because it can be changed into a prime (1217145983) 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, 493747 + ... + 496205.

Almost surely, 2^1217145984 is an apocalyptic number.

It is an amenable number.

1217145984 is an abundant number, since it is smaller than the sum of its proper divisors (2019722016).

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

1217145984 is a wasteful number, since it uses less digits than its factorization.

1217145984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3765 (or 3753 counting only the distinct ones).

The product of its digits is 80640, while the sum is 42.

The square root of 1217145984 is about 34887.6193512828. The cubic root of 1217145984 is about 1067.6958552644.

The spelling of 1217145984 in words is "one billion, two hundred seventeen million, one hundred forty-five thousand, nine hundred eighty-four".