6438491 has 4 divisors (see below), whose sum is σ = 6443592. Its totient is φ = 6433392.

The previous prime is 6438463. The next prime is 6438539. The reversal of 6438491 is 1948346.

6438491 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6438491 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (6438431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 896 + ... + 3698.

It is an arithmetic number, because the mean of its divisors is an integer number (1610898).

Almost surely, 2^6438491 is an apocalyptic number.

6438491 is a deficient number, since it is larger than the sum of its proper divisors (5101).

6438491 is a wasteful number, since it uses less digits than its factorization.

6438491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5100.

The product of its digits is 20736, while the sum is 35.

The square root of 6438491 is about 2537.4181760207. The cubic root of 6438491 is about 186.0350167240.

The spelling of 6438491 in words is "six million, four hundred thirty-eight thousand, four hundred ninety-one".