985979 has 2 divisors, whose sum is σ = 985980. Its totient is φ = 985978.

The previous prime is 985973. The next prime is 985981. The reversal of 985979 is 979589.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 985979 - 2⁸ = 985723 is a prime.

Together with 985981, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (985973) 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, 492989 + 492990.

It is an arithmetic number, because the mean of its divisors is an integer number (492990).

2⁹⁸⁵⁹⁷⁹ is an apocalyptic number.

985979 is a deficient number, since it is larger than the sum of its proper divisors (1).

985979 is an equidigital number, since it uses as much as digits as its factorization.

985979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 204120, while the sum is 47.

The square root of 985979 is about 992.9647526473. The cubic root of 985979 is about 99.5304318420.

The spelling of 985979 in words is "nine hundred eighty-five thousand, nine hundred seventy-nine".