6938889999 has 8 divisors (see below), whose sum is σ = 9252297600. Its totient is φ = 4625704536.

The previous prime is 6938889977. The next prime is 6938890027. The reversal of 6938889999 is 9999888396.

It is a Cunningham number, because it is equal to 83300²-1.

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

It is not a de Polignac number, because 6938889999 - 2⁵ = 6938889967 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6938889959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41652 + ... + 124950.

It is an arithmetic number, because the mean of its divisors is an integer number (1156537200).

Almost surely, 2^6938889999 is an apocalyptic number.

6938889999 is a deficient number, since it is larger than the sum of its proper divisors (2313407601).

6938889999 is a wasteful number, since it uses less digits than its factorization.

6938889999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111069.

The product of its digits is 544195584, while the sum is 78.

The square root of 6938889999 is about 83299.9999939976. Note that the first 5 decimals coincide. The cubic root of 6938889999 is about 1907.3482750215.

The spelling of 6938889999 in words is "six billion, nine hundred thirty-eight million, eight hundred eighty-nine thousand, nine hundred ninety-nine".