6438907 has 4 divisors (see below), whose sum is σ = 6448360. Its totient is φ = 6429456.

The previous prime is 6438893. The next prime is 6438911. The reversal of 6438907 is 7098346.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7098346 = 2 ⋅3549173.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6438907 is a prime.

It is a d-powerful number, because it can be written as 6⁸ + 4¹¹ + 3¹² + 8⁵ + 9³ + 0 + 7² .

It is the 2538-th Hogben number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6438997) by changing a digit.

It is a nontrivial repunit in base 2537.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3618 + ... + 5095.

It is an arithmetic number, because the mean of its divisors is an integer number (1612090).

Almost surely, 2^6438907 is an apocalyptic number.

6438907 is a deficient number, since it is larger than the sum of its proper divisors (9453).

6438907 is an equidigital number, since it uses as much as digits as its factorization.

6438907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9452.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 6438907 is about 2537.5001477832. The cubic root of 6438907 is about 186.0390232995.

The spelling of 6438907 in words is "six million, four hundred thirty-eight thousand, nine hundred seven".