391959 has 12 divisors (see below), whose sum is σ = 587496.
Its totient is φ = 261144.
The previous prime is 391939. The next prime is 391961. The reversal of 391959 is 959193.
It can be divided in two parts, 39195 and 9, that added together give a square (39204 = 1982).
It is not a de Polignac number, because 391959 - 211 = 389911 is a prime.
It is a congruent number.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 391959.
It is not an unprimeable number, because it can be changed into a prime (391939) 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 in 11 ways as a sum of consecutive naturals, for example, 564 + ... + 1049.
It is an arithmetic number, because the mean of its divisors is an integer number (48958).
2391959 is an apocalyptic number.
391959 is a deficient number, since it is larger than the sum of its proper divisors (195537).
391959 is an equidigital number, since it uses as much as digits as its factorization.
391959 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1628 (or 1616 counting only the distinct ones).
The product of its digits is 10935, while the sum is 36.
The square root of 391959 is about 626.0662904198.
The cubic root of 391959 is about 73.1835625548.
The spelling of 391959 in words is "three hundred ninety-one thousand, nine hundred fifty-nine".