340421 has 4 divisors (see below), whose sum is σ = 347712. Its totient is φ = 333132.

The previous prime is 340409. The next prime is 340429. The reversal of 340421 is 124043.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 124043 = 163 ⋅761.

It is a cyclic number.

It is not a de Polignac number, because 340421 - 2¹⁸ = 78277 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 340396 and 340405.

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 340421.

It is not an unprimeable number, because it can be changed into a prime (340429) 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, 3575 + ... + 3668.

It is an arithmetic number, because the mean of its divisors is an integer number (86928).

2³⁴⁰⁴²¹ is an apocalyptic number.

It is an amenable number.

340421 is a deficient number, since it is larger than the sum of its proper divisors (7291).

340421 is an equidigital number, since it uses as much as digits as its factorization.

340421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7290.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 340421 is about 583.4560823233. The cubic root of 340421 is about 69.8241162634.

Adding to 340421 its reverse (124043), we get a palindrome (464464).

It can be divided in two parts, 34042 and 1, that added together give a palindrome (34043).

The spelling of 340421 in words is "three hundred forty thousand, four hundred twenty-one", and thus it is an iban number.