6338991 has 4 divisors (see below), whose sum is σ = 8451992. Its totient is φ = 4225992.

The previous prime is 6338971. The next prime is 6338993. The reversal of 6338991 is 1998336.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 6338991 - 2¹⁰ = 6337967 is a prime.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6338993) 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, 1056496 + ... + 1056501.

It is an arithmetic number, because the mean of its divisors is an integer number (2112998).

Almost surely, 2^6338991 is an apocalyptic number.

6338991 is a deficient number, since it is larger than the sum of its proper divisors (2113001).

6338991 is a wasteful number, since it uses less digits than its factorization.

6338991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2113000.

The product of its digits is 34992, while the sum is 39.

The square root of 6338991 is about 2517.7352918844. The cubic root of 6338991 is about 185.0717131278.

The spelling of 6338991 in words is "six million, three hundred thirty-eight thousand, nine hundred ninety-one".