1986664 has 16 divisors (see below), whose sum is σ = 3762720. Its totient is φ = 983280.

The previous prime is 1986631. The next prime is 1986679. The reversal of 1986664 is 4666891.

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, 382 + ... + 2029.

It is an arithmetic number, because the mean of its divisors is an integer number (235170).

2^1986664 is an apocalyptic number.

It is an amenable number.

1986664 is a deficient number, since it is larger than the sum of its proper divisors (1776056).

1986664 is a wasteful number, since it uses less digits than its factorization.

1986664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2520 (or 2516 counting only the distinct ones).

The product of its digits is 62208, while the sum is 40.

The square root of 1986664 is about 1409.4906881565. The cubic root of 1986664 is about 125.7114417893.

The spelling of 1986664 in words is "one million, nine hundred eighty-six thousand, six hundred sixty-four".