320906 has 4 divisors (see below), whose sum is σ = 481362. Its totient is φ = 160452.

The previous prime is 320899. The next prime is 320911. The reversal of 320906 is 609023.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 609023 = 53 ⋅11491.

It can be written as a sum of positive squares in only one way, i.e., 319225 + 1681 = 565^2 + 41^2 .

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 320906.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80225 + ... + 80228.

2³²⁰⁹⁰⁶ is an apocalyptic number.

320906 is a deficient number, since it is larger than the sum of its proper divisors (160456).

320906 is a wasteful number, since it uses less digits than its factorization.

320906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160455.

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

The square root of 320906 is about 566.4856573648. The cubic root of 320906 is about 68.4635286341.

Adding to 320906 its reverse (609023), we get a palindrome (929929).

The spelling of 320906 in words is "three hundred twenty thousand, nine hundred six".