6638047 has 4 divisors (see below), whose sum is σ = 7148680. Its totient is φ = 6127416.

The previous prime is 6638029. The next prime is 6638057. The reversal of 6638047 is 7408366.

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 6638047 - 2⁷ = 6637919 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6638017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 255297 + ... + 255322.

It is an arithmetic number, because the mean of its divisors is an integer number (1787170).

Almost surely, 2^6638047 is an apocalyptic number.

6638047 is a deficient number, since it is larger than the sum of its proper divisors (510633).

6638047 is a wasteful number, since it uses less digits than its factorization.

6638047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510632.

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 6638047 is about 2576.4407619815. The cubic root of 6638047 is about 187.9374980853.

The spelling of 6638047 in words is "six million, six hundred thirty-eight thousand, forty-seven".