6397439 has 4 divisors (see below), whose sum is σ = 6603840. Its totient is φ = 6191040.

The previous prime is 6397421. The next prime is 6397451. The reversal of 6397439 is 9347936.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6397439 - 2¹⁶ = 6331903 is a prime.

It is a d-powerful number, because it can be written as 6² + 3⁹ + 9² + 7³ + 4 + 3¹³ + 9⁷ .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6397396 and 6397405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6394439) 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, 103154 + ... + 103215.

It is an arithmetic number, because the mean of its divisors is an integer number (1650960).

Almost surely, 2^6397439 is an apocalyptic number.

6397439 is a deficient number, since it is larger than the sum of its proper divisors (206401).

6397439 is a wasteful number, since it uses less digits than its factorization.

6397439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206400.

The product of its digits is 122472, while the sum is 41.

The square root of 6397439 is about 2529.3159154206. The cubic root of 6397439 is about 185.6387852301.

The spelling of 6397439 in words is "six million, three hundred ninety-seven thousand, four hundred thirty-nine".