391879 has 2 divisors, whose sum is σ = 391880. Its totient is φ = 391878.

The previous prime is 391873. The next prime is 391889. The reversal of 391879 is 978193.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 391879 - 2⁵ = 391847 is a prime.

It is a super-3 number, since 3×391879³ = 180541575552133317, which contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (391873) 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, 195939 + 195940.

It is an arithmetic number, because the mean of its divisors is an integer number (195940).

2³⁹¹⁸⁷⁹ is an apocalyptic number.

391879 is a deficient number, since it is larger than the sum of its proper divisors (1).

391879 is an equidigital number, since it uses as much as digits as its factorization.

391879 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13608, while the sum is 37.

The square root of 391879 is about 626.0023961615. The cubic root of 391879 is about 73.1785832216.

The spelling of 391879 in words is "three hundred ninety-one thousand, eight hundred seventy-nine".