6981638 has 4 divisors (see below), whose sum is σ = 10472460. Its totient is φ = 3490818.

The previous prime is 6981631. The next prime is 6981659. The reversal of 6981638 is 8361896.

It is a happy number.

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

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 6981595 and 6981604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6981631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1745408 + ... + 1745411.

It is an arithmetic number, because the mean of its divisors is an integer number (2618115).

Almost surely, 2^6981638 is an apocalyptic number.

6981638 is a deficient number, since it is larger than the sum of its proper divisors (3490822).

6981638 is a wasteful number, since it uses less digits than its factorization.

6981638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3490821.

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

The square root of 6981638 is about 2642.2789406117. The cubic root of 6981638 is about 191.1257087532.

The spelling of 6981638 in words is "six million, nine hundred eighty-one thousand, six hundred thirty-eight".