6445439 has 32 divisors (see below), whose sum is σ = 8902656. Its totient is φ = 4504320.

The previous prime is 6445433. The next prime is 6445441. The reversal of 6445439 is 9345446.

It is a cyclic number.

It is not a de Polignac number, because 6445439 - 2¹² = 6441343 is a prime.

It is a Smith number, since the sum of its digits (35) 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 + 4² + 4⁶ + 5⁷ + 4¹⁰ + 3¹⁴ + 9⁶ .

It is a junction number, because it is equal to n+sod(n) for n = 6445399 and 6445408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6445433) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 46979 + ... + 47115.

It is an arithmetic number, because the mean of its divisors is an integer number (278208).

Almost surely, 2^6445439 is an apocalyptic number.

6445439 is a deficient number, since it is larger than the sum of its proper divisors (2457217).

6445439 is a wasteful number, since it uses less digits than its factorization.

6445439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215.

The product of its digits is 51840, while the sum is 35.

The square root of 6445439 is about 2538.7869150443. The cubic root of 6445439 is about 186.1019116234.

The spelling of 6445439 in words is "six million, four hundred forty-five thousand, four hundred thirty-nine".