1980659 has 2 divisors, whose sum is σ = 1980660. Its totient is φ = 1980658.

The previous prime is 1980637. The next prime is 1980661. The reversal of 1980659 is 9560891.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1980659 - 2¹² = 1976563 is a prime.

Together with 1980661, it forms a pair of twin primes.

It is a Chen prime.

It is a zygodrome in base 2.

It is not a weakly prime, because it can be changed into another prime (1980859) 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 as a sum of consecutive naturals, namely, 990329 + 990330.

It is an arithmetic number, because the mean of its divisors is an integer number (990330).

2^1980659 is an apocalyptic number.

1980659 is a deficient number, since it is larger than the sum of its proper divisors (1).

1980659 is an equidigital number, since it uses as much as digits as its factorization.

1980659 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19440, while the sum is 38.

The square root of 1980659 is about 1407.3588739195. The cubic root of 1980659 is about 125.5846531819.

The spelling of 1980659 in words is "one million, nine hundred eighty thousand, six hundred fifty-nine".