320440 has 16 divisors (see below), whose sum is σ = 721080. Its totient is φ = 128160.

The previous prime is 320431. The next prime is 320449. The reversal of 320440 is 44023.

It is an interprime number because it is at equal distance from previous prime (320431) and next prime (320449).

It is a self number, because there is not a number n which added to its sum of digits gives 320440.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 320440.

It is not an unprimeable number, because it can be changed into a prime (320449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3966 + ... + 4045.

2³²⁰⁴⁴⁰ is an apocalyptic number.

It is an amenable number.

320440 is an abundant number, since it is smaller than the sum of its proper divisors (400640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

320440 is a wasteful number, since it uses less digits than its factorization.

320440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8022 (or 8018 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 13.

The square root of 320440 is about 566.0742000833. The cubic root of 320440 is about 68.4303730685.

Adding to 320440 its reverse (44023), we get a palindrome (364463).

The spelling of 320440 in words is "three hundred twenty thousand, four hundred forty", and thus it is an iban number.