6396638 has 4 divisors (see below), whose sum is σ = 9594960. Its totient is φ = 3198318.

The previous prime is 6396631. The next prime is 6396659. The reversal of 6396638 is 8366936.

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

It is a junction number, because it is equal to n+sod(n) for n = 6396595 and 6396604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6396631) 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 as a sum of consecutive naturals, namely, 1599158 + ... + 1599161.

It is an arithmetic number, because the mean of its divisors is an integer number (2398740).

Almost surely, 2^6396638 is an apocalyptic number.

6396638 is a deficient number, since it is larger than the sum of its proper divisors (3198322).

6396638 is a wasteful number, since it uses less digits than its factorization.

6396638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3198321.

The product of its digits is 139968, while the sum is 41.

The square root of 6396638 is about 2529.1575672544. The cubic root of 6396638 is about 185.6310371883.

The spelling of 6396638 in words is "six million, three hundred ninety-six thousand, six hundred thirty-eight".