391304 has 16 divisors (see below), whose sum is σ = 752220. Its totient is φ = 190720.

The previous prime is 391301. The next prime is 391331. The reversal of 391304 is 403193.

It can be written as a sum of positive squares in 2 ways, for example, as 362404 + 28900 = 602^2 + 170^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 269 + ... + 924.

2³⁹¹³⁰⁴ is an apocalyptic number.

It is an amenable number.

391304 is a deficient number, since it is larger than the sum of its proper divisors (360916).

391304 is a wasteful number, since it uses less digits than its factorization.

391304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1240 (or 1236 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 20.

The square root of 391304 is about 625.5429641519. The cubic root of 391304 is about 73.1427743093.

Adding to 391304 its reverse (403193), we get a palindrome (794497).

It can be divided in two parts, 39130 and 4, that multiplied together give a triangular number (156520 = T₅₅₉).

The spelling of 391304 in words is "three hundred ninety-one thousand, three hundred four".