6445839 has 16 divisors (see below), whose sum is σ = 9158400. Its totient is φ = 4018560.

The previous prime is 6445823. The next prime is 6445841. The reversal of 6445839 is 9385446.

6445839 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 6445839 - 2⁴ = 6445823 is a prime.

It is a d-powerful number, because it can be written as 6⁸ + 4⁵ + 4¹¹ + 5³ + 8⁵ + 3¹² + 9⁴ .

It is a junction number, because it is equal to n+sod(n) for n = 6445797 and 6445806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6445849) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10462 + ... + 11060.

It is an arithmetic number, because the mean of its divisors is an integer number (572400).

Almost surely, 2^6445839 is an apocalyptic number.

6445839 is a deficient number, since it is larger than the sum of its proper divisors (2712561).

6445839 is a wasteful number, since it uses less digits than its factorization.

6445839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 830.

The product of its digits is 103680, while the sum is 39.

The square root of 6445839 is about 2538.8656916032. The cubic root of 6445839 is about 186.1057613340.

The spelling of 6445839 in words is "six million, four hundred forty-five thousand, eight hundred thirty-nine".