6638457 has 16 divisors (see below), whose sum is σ = 10156032. Its totient is φ = 3778320.

The previous prime is 6638407. The next prime is 6638459. The reversal of 6638457 is 7548366.

It is not a de Polignac number, because 6638457 - 2⁶ = 6638393 is a prime.

It is a super-2 number, since 2×6638457² = 88138222681698, which contains 22 as substring.

6638457 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6638459) 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 15 ways as a sum of consecutive naturals, for example, 6832 + ... + 7742.

It is an arithmetic number, because the mean of its divisors is an integer number (634752).

Almost surely, 2^6638457 is an apocalyptic number.

It is an amenable number.

6638457 is a deficient number, since it is larger than the sum of its proper divisors (3517575).

6638457 is a wasteful number, since it uses less digits than its factorization.

6638457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1268.

The product of its digits is 120960, while the sum is 39.

The square root of 6638457 is about 2576.5203278841. The cubic root of 6638457 is about 187.9413673352.

Subtracting 6638457 from its reverse (7548366), we obtain a palindrome (909909).

The spelling of 6638457 in words is "six million, six hundred thirty-eight thousand, four hundred fifty-seven".