340621 has 4 divisors (see below), whose sum is σ = 344032. Its totient is φ = 337212.

The previous prime is 340619. The next prime is 340633. The reversal of 340621 is 126043.

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: 126043 = 241 ⋅523.

It is a cyclic number.

It is not a de Polignac number, because 340621 - 2¹ = 340619 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 340595 and 340604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (340601) 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, 1551 + ... + 1756.

It is an arithmetic number, because the mean of its divisors is an integer number (86008).

2³⁴⁰⁶²¹ is an apocalyptic number.

It is an amenable number.

340621 is a deficient number, since it is larger than the sum of its proper divisors (3411).

340621 is a wasteful number, since it uses less digits than its factorization.

340621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3410.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 340621 is about 583.6274496629. The cubic root of 340621 is about 69.8377876579.

Adding to 340621 its reverse (126043), we get a palindrome (466664).

It can be divided in two parts, 340 and 621, that added together give a square (961 = 31²).

The spelling of 340621 in words is "three hundred forty thousand, six hundred twenty-one".