6638942 has 32 divisors (see below), whose sum is σ = 11404800. Its totient is φ = 2878848.

The previous prime is 6638911. The next prime is 6638953. The reversal of 6638942 is 2498366.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a junction number, because it is equal to n+sod(n) for n = 6638896 and 6638905.

It is a congruent number.

It is an unprimeable number.

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, 27659 + ... + 27897.

It is an arithmetic number, because the mean of its divisors is an integer number (356400).

Almost surely, 2^6638942 is an apocalyptic number.

6638942 is a deficient number, since it is larger than the sum of its proper divisors (4765858).

6638942 is a wasteful number, since it uses less digits than its factorization.

6638942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320.

The product of its digits is 62208, while the sum is 38.

The square root of 6638942 is about 2576.6144453527. The cubic root of 6638942 is about 187.9459441690.

The spelling of 6638942 in words is "six million, six hundred thirty-eight thousand, nine hundred forty-two".