320687 has 2 divisors, whose sum is σ = 320688. Its totient is φ = 320686.

The previous prime is 320669. The next prime is 320693. The reversal of 320687 is 786023.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 320687 - 2⁸ = 320431 is a prime.

It is a plaindrome in base 12.

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 320687.

It is not a weakly prime, because it can be changed into another prime (320627) 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, 160343 + 160344.

It is an arithmetic number, because the mean of its divisors is an integer number (160344).

2³²⁰⁶⁸⁷ is an apocalyptic number.

320687 is a deficient number, since it is larger than the sum of its proper divisors (1).

320687 is an equidigital number, since it uses as much as digits as its factorization.

320687 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 320687 is about 566.2923273363. The cubic root of 320687 is about 68.4479509418.

The spelling of 320687 in words is "three hundred twenty thousand, six hundred eighty-seven".