7918689939 has 32 divisors (see below), whose sum is σ = 11139824640. Its totient is φ = 4996857600.

The previous prime is 7918689931. The next prime is 7918689967. The reversal of 7918689939 is 9399868197.

7918689939 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 7918689939 - 2³ = 7918689931 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7918689931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1722534 + ... + 1727124.

It is an arithmetic number, because the mean of its divisors is an integer number (348119520).

Almost surely, 2^7918689939 is an apocalyptic number.

7918689939 is a deficient number, since it is larger than the sum of its proper divisors (3221134701).

7918689939 is a wasteful number, since it uses less digits than its factorization.

7918689939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5051.

The product of its digits is 52907904, while the sum is 69.

The square root of 7918689939 is about 88987.0211828669. The cubic root of 7918689939 is about 1993.2010750836.

The spelling of 7918689939 in words is "seven billion, nine hundred eighteen million, six hundred eighty-nine thousand, nine hundred thirty-nine".