1983979 has 2 divisors, whose sum is σ = 1983980. Its totient is φ = 1983978.

The previous prime is 1983967. The next prime is 1983997. The reversal of 1983979 is 9793891.

Together with next prime (1983997) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is an emirp because it is prime and its reverse (9793891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1983979 - 2⁷ = 1983851 is a prime.

It is a Chen prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another 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 as a sum of consecutive naturals, namely, 991989 + 991990.

It is an arithmetic number, because the mean of its divisors is an integer number (991990).

2^1983979 is an apocalyptic number.

1983979 is a deficient number, since it is larger than the sum of its proper divisors (1).

1983979 is an equidigital number, since it uses as much as digits as its factorization.

1983979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 122472, while the sum is 46.

The square root of 1983979 is about 1408.5378944139. The cubic root of 1983979 is about 125.6547827541.

The spelling of 1983979 in words is "one million, nine hundred eighty-three thousand, nine hundred seventy-nine".