1986688 has 64 divisors (see below), whose sum is σ = 4626720. Its totient is φ = 839680.

The previous prime is 1986683. The next prime is 1986689. The reversal of 1986688 is 8866891.

It is a tau number, because it is divible by the number of its divisors (64).

It is not an unprimeable number, because it can be changed into a prime (1986683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23895 + ... + 23977.

2^1986688 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 1986688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2313360).

1986688 is an abundant number, since it is smaller than the sum of its proper divisors (2640032).

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

1986688 is a wasteful number, since it uses less digits than its factorization.

1986688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125 (or 113 counting only the distinct ones).

The product of its digits is 165888, while the sum is 46.

The square root of 1986688 is about 1409.4992018444. The cubic root of 1986688 is about 125.7119480085.

It can be divided in two parts, 198 and 6688, that added together give a palindrome (6886).

The spelling of 1986688 in words is "one million, nine hundred eighty-six thousand, six hundred eighty-eight".