1989806 has 36 divisors (see below), whose sum is σ = 3825432. Its totient is φ = 760032.

The previous prime is 1989803. The next prime is 1989811. The reversal of 1989806 is 6089891.

It is a super-3 number, since 3×1989806³ = 23634883339438855848, which contains 333 as substring.

It is a congruent number.

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 (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 68600 + ... + 68628.

It is an arithmetic number, because the mean of its divisors is an integer number (106262).

2^1989806 is an apocalyptic number.

1989806 is a deficient number, since it is larger than the sum of its proper divisors (1835626).

1989806 is a wasteful number, since it uses less digits than its factorization.

1989806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93 (or 51 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 41.

The square root of 1989806 is about 1410.6048348138. The cubic root of 1989806 is about 125.7776796808. Note that the first 3 decimals are identical.

The spelling of 1989806 in words is "one million, nine hundred eighty-nine thousand, eight hundred six".