320438905 has 8 divisors (see below), whose sum is σ = 384636672. Its totient is φ = 256277808.

The previous prime is 320438897. The next prime is 320438939. The reversal of 320438905 is 509834023.

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 320438905 - 2³ = 320438897 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16702 + ... + 30328.

It is an arithmetic number, because the mean of its divisors is an integer number (48079584).

Almost surely, 2^320438905 is an apocalyptic number.

It is an amenable number.

320438905 is a deficient number, since it is larger than the sum of its proper divisors (64197767).

320438905 is a wasteful number, since it uses less digits than its factorization.

320438905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18335.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 320438905 is about 17900.8073840260. The cubic root of 320438905 is about 684.3029512220.

The spelling of 320438905 in words is "three hundred twenty million, four hundred thirty-eight thousand, nine hundred five".