6438535 has 4 divisors (see below), whose sum is σ = 7726248. Its totient is φ = 5150824.

The previous prime is 6438463. The next prime is 6438539. The reversal of 6438535 is 5358346.

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 6438535 - 2¹³ = 6430343 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 6438535.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6438539) 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, 643849 + ... + 643858.

It is an arithmetic number, because the mean of its divisors is an integer number (1931562).

Almost surely, 2^6438535 is an apocalyptic number.

6438535 is a deficient number, since it is larger than the sum of its proper divisors (1287713).

6438535 is a wasteful number, since it uses less digits than its factorization.

6438535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1287712.

The product of its digits is 43200, while the sum is 34.

The square root of 6438535 is about 2537.4268462362. The cubic root of 6438535 is about 186.0354405046.

The spelling of 6438535 in words is "six million, four hundred thirty-eight thousand, five hundred thirty-five".