1982689 has 4 divisors (see below), whose sum is σ = 1993156. Its totient is φ = 1972224.

The previous prime is 1982681. The next prime is 1982713. The reversal of 1982689 is 9862891.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9862891 = 89 ⋅110819.

It can be written as a sum of positive squares in 2 ways, for example, as 462400 + 1520289 = 680^2 + 1233^2 .

It is a cyclic number.

It is not a de Polignac number, because 1982689 - 2³ = 1982681 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1982681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4944 + ... + 5329.

It is an arithmetic number, because the mean of its divisors is an integer number (498289).

2^1982689 is an apocalyptic number.

It is an amenable number.

1982689 is a deficient number, since it is larger than the sum of its proper divisors (10467).

1982689 is a wasteful number, since it uses less digits than its factorization.

1982689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10466.

The product of its digits is 62208, while the sum is 43.

The square root of 1982689 is about 1408.0798983012. The cubic root of 1982689 is about 125.6275429136.

The spelling of 1982689 in words is "one million, nine hundred eighty-two thousand, six hundred eighty-nine".