6438389 has 4 divisors (see below), whose sum is σ = 6575424. Its totient is φ = 6301356.

The previous prime is 6438379. The next prime is 6438391. The reversal of 6438389 is 9838346.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6438389 - 2⁴ = 6438373 is a prime.

It is a d-powerful number, because it can be written as 6⁸ + 4¹¹ + 3⁵ + 8 + 3¹² + 8⁵ + 9 .

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6438379) 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, 68447 + ... + 68540.

It is an arithmetic number, because the mean of its divisors is an integer number (1643856).

Almost surely, 2^6438389 is an apocalyptic number.

It is an amenable number.

6438389 is a deficient number, since it is larger than the sum of its proper divisors (137035).

6438389 is a wasteful number, since it uses less digits than its factorization.

6438389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137034.

The product of its digits is 124416, while the sum is 41.

The square root of 6438389 is about 2537.3980767708. The cubic root of 6438389 is about 186.0340343162.

The spelling of 6438389 in words is "six million, four hundred thirty-eight thousand, three hundred eighty-nine".