6981538 has 4 divisors (see below), whose sum is σ = 10472310. Its totient is φ = 3490768.

The previous prime is 6981503. The next prime is 6981539. The reversal of 6981538 is 8351896.

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., 3908529 + 3073009 = 1977^2 + 1753^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 6981538.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6981539) by changing a digit.

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 as a sum of consecutive naturals, namely, 1745383 + ... + 1745386.

Almost surely, 2^6981538 is an apocalyptic number.

6981538 is a deficient number, since it is larger than the sum of its proper divisors (3490772).

6981538 is a wasteful number, since it uses less digits than its factorization.

6981538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3490771.

The product of its digits is 51840, while the sum is 40.

The square root of 6981538 is about 2642.2600174850. The cubic root of 6981538 is about 191.1247962327.

The spelling of 6981538 in words is "six million, nine hundred eighty-one thousand, five hundred thirty-eight".