7138718979 has 8 divisors (see below), whose sum is σ = 10878048000. Its totient is φ = 4079267976.

The previous prime is 7138718947. The next prime is 7138718989. The reversal of 7138718979 is 9798178317.

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

It is not a de Polignac number, because 7138718979 - 2⁵ = 7138718947 is a prime.

It is a super-2 number, since 2×7138718979² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7138718989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 169969479 + ... + 169969520.

It is an arithmetic number, because the mean of its divisors is an integer number (1359756000).

Almost surely, 2^7138718979 is an apocalyptic number.

7138718979 is a deficient number, since it is larger than the sum of its proper divisors (3739329021).

7138718979 is a wasteful number, since it uses less digits than its factorization.

7138718979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339939009.

The product of its digits is 5334336, while the sum is 60.

The square root of 7138718979 is about 84490.9402184637. The cubic root of 7138718979 is about 1925.4848031991.

The spelling of 7138718979 in words is "seven billion, one hundred thirty-eight million, seven hundred eighteen thousand, nine hundred seventy-nine".