321240 has 32 divisors (see below), whose sum is σ = 964080. Its totient is φ = 85632.

The previous prime is 321239. The next prime is 321247. The reversal of 321240 is 42123.

It is a Harshad number since it is a multiple of its sum of digits (12).

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 321240.

It is not an unprimeable number, because it can be changed into a prime (321247) 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, 1219 + ... + 1458.

2³²¹²⁴⁰ is an apocalyptic number.

321240 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

321240 is an abundant number, since it is smaller than the sum of its proper divisors (642840).

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

321240 is a wasteful number, since it uses less digits than its factorization.

321240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2691 (or 2687 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 321240 is about 566.7803807473. The cubic root of 321240 is about 68.4872727522.

Adding to 321240 its reverse (42123), we get a palindrome (363363).

It can be divided in two parts, 321 and 240, that added together give a triangular number (561 = T₃₃).

The spelling of 321240 in words is "three hundred twenty-one thousand, two hundred forty", and thus it is an iban number.