320257 has 4 divisors (see below), whose sum is σ = 366016. Its totient is φ = 274500.

The previous prime is 320239. The next prime is 320267. The reversal of 320257 is 752023.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 320257 - 2¹¹ = 318209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (320237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22869 + ... + 22882.

It is an arithmetic number, because the mean of its divisors is an integer number (91504).

2³²⁰²⁵⁷ is an apocalyptic number.

It is an amenable number.

320257 is a deficient number, since it is larger than the sum of its proper divisors (45759).

320257 is an equidigital number, since it uses as much as digits as its factorization.

320257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45758.

The product of its (nonzero) digits is 420, while the sum is 19.

The square root of 320257 is about 565.9125374119. The cubic root of 320257 is about 68.4173439597.

The spelling of 320257 in words is "three hundred twenty thousand, two hundred fifty-seven".