6861638 has 8 divisors (see below), whose sum is σ = 11762832. Its totient is φ = 2940696.

The previous prime is 6861629. The next prime is 6861691. The reversal of 6861638 is 8361686.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a nialpdrome in base 14.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 245045 + ... + 245072.

It is an arithmetic number, because the mean of its divisors is an integer number (1470354).

Almost surely, 2^6861638 is an apocalyptic number.

6861638 is a deficient number, since it is larger than the sum of its proper divisors (4901194).

6861638 is a wasteful number, since it uses less digits than its factorization.

6861638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490126.

The product of its digits is 41472, while the sum is 38.

The square root of 6861638 is about 2619.4728477310. The cubic root of 6861638 is about 190.0243551420.

The spelling of 6861638 in words is "six million, eight hundred sixty-one thousand, six hundred thirty-eight".