1983989 has 8 divisors (see below), whose sum is σ = 2283648. Its totient is φ = 1688400.

The previous prime is 1983979. The next prime is 1983997. The reversal of 1983989 is 9893891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1983989 - 2¹² = 1979893 is a prime.

It is a Duffinian number.

It is a plaindrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1983929) 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 7 ways as a sum of consecutive naturals, for example, 119 + ... + 1995.

It is an arithmetic number, because the mean of its divisors is an integer number (285456).

2^1983989 is an apocalyptic number.

It is an amenable number.

1983989 is a deficient number, since it is larger than the sum of its proper divisors (299659).

1983989 is a wasteful number, since it uses less digits than its factorization.

1983989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2035.

The product of its digits is 139968, while the sum is 47.

The square root of 1983989 is about 1408.5414441897. The cubic root of 1983989 is about 125.6549938695.

It can be divided in two parts, 19839 and 89, that multiplied together give a palindrome (1765671).

The spelling of 1983989 in words is "one million, nine hundred eighty-three thousand, nine hundred eighty-nine".