1989808 has 10 divisors (see below), whose sum is σ = 3855284. Its totient is φ = 994896.

The previous prime is 1989803. The next prime is 1989811. The reversal of 1989808 is 8089891.

It is not an unprimeable number, because it can be changed into a prime (1989803) 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 as a sum of consecutive naturals, namely, 62166 + ... + 62197.

2^1989808 is an apocalyptic number.

It is an amenable number.

1989808 is a deficient number, since it is larger than the sum of its proper divisors (1865476).

1989808 is a wasteful number, since it uses less digits than its factorization.

1989808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124371 (or 124365 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 43.

The square root of 1989808 is about 1410.6055437294. The cubic root of 1989808 is about 125.7777218215. Note that the first 4 decimals are identical.

The spelling of 1989808 in words is "one million, nine hundred eighty-nine thousand, eight hundred eight".