6420443 has 4 divisors (see below), whose sum is σ = 6428208. Its totient is φ = 6412680.

The previous prime is 6420437. The next prime is 6420451. The reversal of 6420443 is 3440246.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3440246 = 2 ⋅1720123.

It is a cyclic number.

It is not a de Polignac number, because 6420443 - 2¹⁰ = 6419419 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6420413) 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, 2471 + ... + 4352.

It is an arithmetic number, because the mean of its divisors is an integer number (1607052).

Almost surely, 2^6420443 is an apocalyptic number.

6420443 is a deficient number, since it is larger than the sum of its proper divisors (7765).

6420443 is an equidigital number, since it uses as much as digits as its factorization.

6420443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7764.

The product of its (nonzero) digits is 2304, while the sum is 23.

The square root of 6420443 is about 2533.8593094329. The cubic root of 6420443 is about 185.8610265704.

Adding to 6420443 its reverse (3440246), we get a palindrome (9860689).

The spelling of 6420443 in words is "six million, four hundred twenty thousand, four hundred forty-three".