340721 has 8 divisors (see below), whose sum is σ = 364800. Its totient is φ = 317520.

The previous prime is 340709. The next prime is 340723. The reversal of 340721 is 127043.

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 340721 - 2⁶ = 340657 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 340721.

It is not an unprimeable number, because it can be changed into a prime (340723) 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, 710 + ... + 1088.

It is an arithmetic number, because the mean of its divisors is an integer number (45600).

2³⁴⁰⁷²¹ is an apocalyptic number.

340721 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

340721 is a deficient number, since it is larger than the sum of its proper divisors (24079).

340721 is a wasteful number, since it uses less digits than its factorization.

340721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 439.

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

The square root of 340721 is about 583.7131144663. The cubic root of 340721 is about 69.8446213484.

Adding to 340721 its reverse (127043), we get a palindrome (467764).

The spelling of 340721 in words is "three hundred forty thousand, seven hundred twenty-one", and thus it is an iban number.