6442209 has 6 divisors (see below), whose sum is σ = 9305426. Its totient is φ = 4294800.

The previous prime is 6442169. The next prime is 6442223. The reversal of 6442209 is 9022446.

It can be written as a sum of positive squares in only one way, i.e., 6350400 + 91809 = 2520^2 + 303^2 .

It is not a de Polignac number, because 6442209 - 2⁷ = 6442081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6442259) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 357892 + ... + 357909.

Almost surely, 2^6442209 is an apocalyptic number.

It is an amenable number.

6442209 is a deficient number, since it is larger than the sum of its proper divisors (2863217).

6442209 is a wasteful number, since it uses less digits than its factorization.

6442209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 715807 (or 715804 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 6442209 is about 2538.1507047455. The cubic root of 6442209 is about 186.0708193728.

The spelling of 6442209 in words is "six million, four hundred forty-two thousand, two hundred nine".