320289905 has 8 divisors (see below), whose sum is σ = 413913192. Its totient is φ = 236521728.

The previous prime is 320289901. The next prime is 320289917. The reversal of 320289905 is 509982023.

It can be written as a sum of positive squares in 4 ways, for example, as 25240576 + 295049329 = 5024^2 + 17177^2 .

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 320289905 - 2² = 320289901 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (320289901) 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, 2463704 + ... + 2463833.

It is an arithmetic number, because the mean of its divisors is an integer number (51739149).

Almost surely, 2^320289905 is an apocalyptic number.

It is an amenable number.

320289905 is a deficient number, since it is larger than the sum of its proper divisors (93623287).

320289905 is a wasteful number, since it uses less digits than its factorization.

320289905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4927555.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 320289905 is about 17896.6450766617. The cubic root of 320289905 is about 684.1968707329.

The spelling of 320289905 in words is "three hundred twenty million, two hundred eighty-nine thousand, nine hundred five".