6681938 has 4 divisors (see below), whose sum is σ = 10022910. Its totient is φ = 3340968.

The previous prime is 6681931. The next prime is 6681947. The reversal of 6681938 is 8391866.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 4380649 + 2301289 = 2093^2 + 1517^2 .

It is a junction number, because it is equal to n+sod(n) for n = 6681895 and 6681904.

It is not an unprimeable number, because it can be changed into a prime (6681931) 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, 1670483 + ... + 1670486.

Almost surely, 2^6681938 is an apocalyptic number.

6681938 is a deficient number, since it is larger than the sum of its proper divisors (3340972).

6681938 is a wasteful number, since it uses less digits than its factorization.

6681938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3340971.

The product of its digits is 62208, while the sum is 41.

The square root of 6681938 is about 2584.9444868314. The cubic root of 6681938 is about 188.3508049332.

The spelling of 6681938 in words is "six million, six hundred eighty-one thousand, nine hundred thirty-eight".