1986931968 has 216 divisors, whose sum is σ = 6322190112. Its totient is φ = 551964672.

The previous prime is 1986931913. The next prime is 1986931987. The reversal of 1986931968 is 8691396891.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1391671 + ... + 1393097.

Almost surely, 2^1986931968 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 1986931968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3161095056).

1986931968 is an abundant number, since it is smaller than the sum of its proper divisors (4335258144).

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

1986931968 is a wasteful number, since it uses less digits than its factorization.

1986931968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1497 (or 1476 counting only the distinct ones).

The product of its digits is 5038848, while the sum is 60.

The square root of 1986931968 is about 44575.0150644955. The cubic root of 1986931968 is about 1257.1709366416.

It can be divided in two parts, 198693 and 1968, that added together give a triangular number (200661 = T₆₃₃).

The spelling of 1986931968 in words is "one billion, nine hundred eighty-six million, nine hundred thirty-one thousand, nine hundred sixty-eight".