1216586984 has 16 divisors (see below), whose sum is σ = 2294762400. Its totient is φ = 604650352.

The previous prime is 1216586977. The next prime is 1216586999. The reversal of 1216586984 is 4896856121.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 453974 + ... + 456645.

It is an arithmetic number, because the mean of its divisors is an integer number (143422650).

Almost surely, 2^1216586984 is an apocalyptic number.

It is an amenable number.

1216586984 is a deficient number, since it is larger than the sum of its proper divisors (1078175416).

1216586984 is a wasteful number, since it uses less digits than its factorization.

1216586984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 910792 (or 910788 counting only the distinct ones).

The product of its digits is 829440, while the sum is 50.

The square root of 1216586984 is about 34879.6069931988. The cubic root of 1216586984 is about 1067.5323762775.

The spelling of 1216586984 in words is "one billion, two hundred sixteen million, five hundred eighty-six thousand, nine hundred eighty-four".