321740 has 12 divisors (see below), whose sum is σ = 675696. Its totient is φ = 128688.

The previous prime is 321733. The next prime is 321743. The reversal of 321740 is 47123.

It is a happy number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 321740.

It is not an unprimeable number, because it can be changed into a prime (321743) 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, 8024 + ... + 8063.

It is an arithmetic number, because the mean of its divisors is an integer number (56308).

2³²¹⁷⁴⁰ is an apocalyptic number.

It is an amenable number.

321740 is an abundant number, since it is smaller than the sum of its proper divisors (353956).

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

321740 is a wasteful number, since it uses less digits than its factorization.

321740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16096 (or 16094 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 17.

The square root of 321740 is about 567.2212972024. The cubic root of 321740 is about 68.5227870980.

Adding to 321740 its reverse (47123), we get a palindrome (368863).

The spelling of 321740 in words is "three hundred twenty-one thousand, seven hundred forty", and thus it is an iban number.