6340421 has 4 divisors (see below), whose sum is σ = 6398700. Its totient is φ = 6282144.

The previous prime is 6340409. The next prime is 6340423. The reversal of 6340421 is 1240436.

It is a happy number.

6340421 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3150625 + 3189796 = 1775^2 + 1786^2 .

It is a cyclic number.

It is not a de Polignac number, because 6340421 - 2¹⁴ = 6324037 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6340393 and 6340402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6340423) 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, 28976 + ... + 29193.

It is an arithmetic number, because the mean of its divisors is an integer number (1599675).

Almost surely, 2^6340421 is an apocalyptic number.

It is an amenable number.

6340421 is a deficient number, since it is larger than the sum of its proper divisors (58279).

6340421 is a wasteful number, since it uses less digits than its factorization.

6340421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58278.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 6340421 is about 2518.0192612448. The cubic root of 6340421 is about 185.0856287310.

Adding to 6340421 its reverse (1240436), we get a palindrome (7580857).

The spelling of 6340421 in words is "six million, three hundred forty thousand, four hundred twenty-one".