6438715 has 4 divisors (see below), whose sum is σ = 7726464. Its totient is φ = 5150968.

The previous prime is 6438697. The next prime is 6438721. The reversal of 6438715 is 5178346.

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 6438715 - 2¹¹ = 6436667 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 643867 + ... + 643876.

It is an arithmetic number, because the mean of its divisors is an integer number (1931616).

Almost surely, 2^6438715 is an apocalyptic number.

6438715 is a deficient number, since it is larger than the sum of its proper divisors (1287749).

6438715 is a wasteful number, since it uses less digits than its factorization.

6438715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1287748.

The product of its digits is 20160, while the sum is 34.

The square root of 6438715 is about 2537.4623149911. The cubic root of 6438715 is about 186.0371741323.

The spelling of 6438715 in words is "six million, four hundred thirty-eight thousand, seven hundred fifteen".