6445239 has 8 divisors (see below), whose sum is σ = 8605440. Its totient is φ = 4290936.

The previous prime is 6445223. The next prime is 6445247. The reversal of 6445239 is 9325446.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6445239 - 2⁴ = 6445223 is a prime.

It is a super-2 number, since 2×6445239² = 83082211534242, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a d-powerful number, because it can be written as 6³ + 4⁷ + 4¹¹ + 5⁷ + 2²¹ + 3¹⁰ + 9 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6445259) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3172 + ... + 4790.

It is an arithmetic number, because the mean of its divisors is an integer number (1075680).

Almost surely, 2^6445239 is an apocalyptic number.

6445239 is a deficient number, since it is larger than the sum of its proper divisors (2160201).

6445239 is a wasteful number, since it uses less digits than its factorization.

6445239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2949.

The product of its digits is 25920, while the sum is 33.

The square root of 6445239 is about 2538.7475258481. The cubic root of 6445239 is about 186.0999867083.

The spelling of 6445239 in words is "six million, four hundred forty-five thousand, two hundred thirty-nine".