1986947868 has 24 divisors (see below), whose sum is σ = 4681226368. Its totient is φ = 655885296.

The previous prime is 1986947849. The next prime is 1986947891. The reversal of 1986947868 is 8687496891.

It is a junction number, because it is equal to n+sod(n) for n = 1986947799 and 1986947808.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 802546 + ... + 805017.

Almost surely, 2^1986947868 is an apocalyptic number.

It is an amenable number.

1986947868 is an abundant number, since it is smaller than the sum of its proper divisors (2694278500).

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

1986947868 is a wasteful number, since it uses less digits than its factorization.

1986947868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1607673 (or 1607671 counting only the distinct ones).

The product of its digits is 41803776, while the sum is 66.

The square root of 1986947868 is about 44575.1934151721. The cubic root of 1986947868 is about 1257.1742900469.

The spelling of 1986947868 in words is "one billion, nine hundred eighty-six million, nine hundred forty-seven thousand, eight hundred sixty-eight".