320345437 has 4 divisors (see below), whose sum is σ = 323517276. Its totient is φ = 317173600.

The previous prime is 320345429. The next prime is 320345447. The reversal of 320345437 is 734543023.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 240529081 + 79816356 = 15509^2 + 8934^2 .

It is a cyclic number.

It is not a de Polignac number, because 320345437 - 2³ = 320345429 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 320345399 and 320345408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320345407) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1585768 + ... + 1585969.

It is an arithmetic number, because the mean of its divisors is an integer number (80879319).

Almost surely, 2^320345437 is an apocalyptic number.

It is an amenable number.

320345437 is a deficient number, since it is larger than the sum of its proper divisors (3171839).

320345437 is a wasteful number, since it uses less digits than its factorization.

320345437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3171838.

The product of its (nonzero) digits is 30240, while the sum is 31.

The square root of 320345437 is about 17898.1964733880. The cubic root of 320345437 is about 684.2364105627.

The spelling of 320345437 in words is "three hundred twenty million, three hundred forty-five thousand, four hundred thirty-seven".