1986217968 has 80 divisors (see below), whose sum is σ = 5872124160. Its totient is φ = 566711808.

The previous prime is 1986217951. The next prime is 1986217999. The reversal of 1986217968 is 8697126891.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 268171 + ... + 275477.

It is an arithmetic number, because the mean of its divisors is an integer number (73401552).

Almost surely, 2^1986217968 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1986217968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2936062080).

1986217968 is an abundant number, since it is smaller than the sum of its proper divisors (3885906192).

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

1986217968 is a wasteful number, since it uses less digits than its factorization.

1986217968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8134 (or 8128 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 57.

The square root of 1986217968 is about 44567.0053739311. The cubic root of 1986217968 is about 1257.0203313191.

The spelling of 1986217968 in words is "one billion, nine hundred eighty-six million, two hundred seventeen thousand, nine hundred sixty-eight".