84979 has 2 divisors, whose sum is σ = 84980. Its totient is φ = 84978.

The previous prime is 84977. The next prime is 84991. The reversal of 84979 is 97948.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 84979 - 2¹ = 84977 is a prime.

Together with 84977, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (84977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42489 + 42490.

It is an arithmetic number, because the mean of its divisors is an integer number (42490).

2⁸⁴⁹⁷⁹ is an apocalyptic number.

84979 is a deficient number, since it is larger than the sum of its proper divisors (1).

84979 is an equidigital number, since it uses as much as digits as its factorization.

84979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 37.

The square root of 84979 is about 291.5115778147. The cubic root of 84979 is about 43.9646755048.

The spelling of 84979 in words is "eighty-four thousand, nine hundred seventy-nine".