7919438517 has 12 divisors (see below), whose sum is σ = 11718194124. Its totient is φ = 5150854080.

The previous prime is 7919438509. The next prime is 7919438543. The reversal of 7919438517 is 7158349197.

It is a happy number.

7919438517 is a `hidden beast` number, since 7 + 9 + 1 + 94 + 38 + 517 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 761263281 + 7158175236 = 27591^2 + 84606^2 .

It is not a de Polignac number, because 7919438517 - 2³ = 7919438509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7919438567) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10730578 + ... + 10731315.

It is an arithmetic number, because the mean of its divisors is an integer number (976516177).

Almost surely, 2^7919438517 is an apocalyptic number.

It is an amenable number.

7919438517 is a deficient number, since it is larger than the sum of its proper divisors (3798755607).

7919438517 is a wasteful number, since it uses less digits than its factorization.

7919438517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21461940 (or 21461937 counting only the distinct ones).

The product of its digits is 1905120, while the sum is 54.

The square root of 7919438517 is about 88991.2271912237. The cubic root of 7919438517 is about 1993.2638809042.

It can be divided in two parts, 79194 and 38517, that added together give a palindrome (117711).

The spelling of 7919438517 in words is "seven billion, nine hundred nineteen million, four hundred thirty-eight thousand, five hundred seventeen".