1989688 has 16 divisors (see below), whose sum is σ = 3782880. Its totient is φ = 980928.

The previous prime is 1989683. The next prime is 1989721. The reversal of 1989688 is 8869891.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1989683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1120 + ... + 2287.

It is an arithmetic number, because the mean of its divisors is an integer number (236430).

2^1989688 is an apocalyptic number.

It is an amenable number.

1989688 is a deficient number, since it is larger than the sum of its proper divisors (1793192).

1989688 is a wasteful number, since it uses less digits than its factorization.

1989688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3486 (or 3482 counting only the distinct ones).

The product of its digits is 248832, while the sum is 49.

The square root of 1989688 is about 1410.5630081638. The cubic root of 1989688 is about 125.7751933313.

The spelling of 1989688 in words is "one million, nine hundred eighty-nine thousand, six hundred eighty-eight".