1982989 has 2 divisors, whose sum is σ = 1982990. Its totient is φ = 1982988.

The previous prime is 1982987. The next prime is 1982993. The reversal of 1982989 is 9892891.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1550025 + 432964 = 1245^2 + 658^2 .

It is an emirp because it is prime and its reverse (9892891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1982989 - 2¹ = 1982987 is a prime.

Together with 1982987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1982987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 991494 + 991495.

It is an arithmetic number, because the mean of its divisors is an integer number (991495).

2^1982989 is an apocalyptic number.

It is an amenable number.

1982989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1982989 is an equidigital number, since it uses as much as digits as its factorization.

1982989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 93312, while the sum is 46.

The square root of 1982989 is about 1408.1864223177. The cubic root of 1982989 is about 125.6338788144.

The spelling of 1982989 in words is "one million, nine hundred eighty-two thousand, nine hundred eighty-nine".