320745 has 8 divisors (see below), whose sum is σ = 513216. Its totient is φ = 171056.

The previous prime is 320741. The next prime is 320759. The reversal of 320745 is 547023.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 320745 - 2² = 320741 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (320741) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10677 + ... + 10706.

It is an arithmetic number, because the mean of its divisors is an integer number (64152).

2³²⁰⁷⁴⁵ is an apocalyptic number.

It is an amenable number.

320745 is a deficient number, since it is larger than the sum of its proper divisors (192471).

320745 is a wasteful number, since it uses less digits than its factorization.

320745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21391.

The product of its (nonzero) digits is 840, while the sum is 21.

The square root of 320745 is about 566.3435353211. The cubic root of 320745 is about 68.4520772309.

Adding to 320745 its reverse (547023), we get a palindrome (867768).

The spelling of 320745 in words is "three hundred twenty thousand, seven hundred forty-five".