6987939381 has 24 divisors (see below), whose sum is σ = 10241201880. Its totient is φ = 4590660096.

The previous prime is 6987939379. The next prime is 6987939421. The reversal of 6987939381 is 1839397896.

It can be written as a sum of positive squares in 4 ways, for example, as 582498225 + 6405441156 = 24135^2 + 80034^2 .

It is not a de Polignac number, because 6987939381 - 2¹ = 6987939379 is a prime.

It is a super-2 number, since 2×6987939381² = 97662593585061326322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6987939311) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 834825 + ... + 843153.

It is an arithmetic number, because the mean of its divisors is an integer number (426716745).

Almost surely, 2^6987939381 is an apocalyptic number.

It is an amenable number.

6987939381 is a deficient number, since it is larger than the sum of its proper divisors (3253262499).

6987939381 is a wasteful number, since it uses less digits than its factorization.

6987939381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9685 (or 9682 counting only the distinct ones).

The product of its digits is 17635968, while the sum is 63.

The square root of 6987939381 is about 83593.8955965087. The cubic root of 6987939381 is about 1911.8319257739.

The spelling of 6987939381 in words is "six billion, nine hundred eighty-seven million, nine hundred thirty-nine thousand, three hundred eighty-one".