1986666892 has 24 divisors (see below), whose sum is σ = 3977245440. Its totient is φ = 850590480.

The previous prime is 1986666839. The next prime is 1986666901. The reversal of 1986666892 is 2986666891.

It is a self number, because there is not a number n which added to its sum of digits gives 1986666892.

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, 5542 + ... + 63277.

It is an arithmetic number, because the mean of its divisors is an integer number (165718560).

Almost surely, 2^1986666892 is an apocalyptic number.

It is an amenable number.

1986666892 is an abundant number, since it is smaller than the sum of its proper divisors (1990578548).

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

1986666892 is a wasteful number, since it uses less digits than its factorization.

1986666892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69861 (or 69859 counting only the distinct ones).

The product of its digits is 13436928, while the sum is 61.

The square root of 1986666892 is about 44572.0415956012. The cubic root of 1986666892 is about 1257.1150278890.

Subtracting 1986666892 from its reverse (2986666891), we obtain a palindrome (999999999).

The spelling of 1986666892 in words is "one billion, nine hundred eighty-six million, six hundred sixty-six thousand, eight hundred ninety-two".