7893947515 has 4 divisors (see below), whose sum is σ = 9472737024. Its totient is φ = 6315158008.

The previous prime is 7893947513. The next prime is 7893947527. The reversal of 7893947515 is 5157493987.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5157493987 = 23 ⋅224238869.

It is a cyclic number.

It is not a de Polignac number, because 7893947515 - 2¹ = 7893947513 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7893947515.

It is not an unprimeable number, because it can be changed into a prime (7893947513) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 789394747 + ... + 789394756.

It is an arithmetic number, because the mean of its divisors is an integer number (2368184256).

Almost surely, 2^7893947515 is an apocalyptic number.

7893947515 is a deficient number, since it is larger than the sum of its proper divisors (1578789509).

7893947515 is a wasteful number, since it uses less digits than its factorization.

7893947515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1578789508.

The product of its digits is 9525600, while the sum is 58.

The square root of 7893947515 is about 88847.8897610967. The cubic root of 7893947515 is about 1991.1229502042.

The spelling of 7893947515 in words is "seven billion, eight hundred ninety-three million, nine hundred forty-seven thousand, five hundred fifteen".