6438641 has 8 divisors (see below), whose sum is σ = 7042464. Its totient is φ = 5837920.

The previous prime is 6438637. The next prime is 6438647. The reversal of 6438641 is 1468346.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6438641 - 2² = 6438637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6438598 and 6438607.

It is not an unprimeable number, because it can be changed into a prime (6438647) 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 7 ways as a sum of consecutive naturals, for example, 7085 + ... + 7941.

It is an arithmetic number, because the mean of its divisors is an integer number (880308).

Almost surely, 2^6438641 is an apocalyptic number.

It is an amenable number.

6438641 is a deficient number, since it is larger than the sum of its proper divisors (603823).

6438641 is a wasteful number, since it uses less digits than its factorization.

6438641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1551.

The product of its digits is 13824, while the sum is 32.

The square root of 6438641 is about 2537.4477334519. The cubic root of 6438641 is about 186.0364614226.

The spelling of 6438641 in words is "six million, four hundred thirty-eight thousand, six hundred forty-one".