7942247817 has 32 divisors (see below), whose sum is σ = 12865643520. Its totient is φ = 4256971200.

The previous prime is 7942247809. The next prime is 7942247851. The reversal of 7942247817 is 7187422497.

It is not a de Polignac number, because 7942247817 - 2³ = 7942247809 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7942247817.

It is not an unprimeable number, because it can be changed into a prime (7942247897) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 58243 + ... + 138840.

It is an arithmetic number, because the mean of its divisors is an integer number (402051360).

Almost surely, 2^7942247817 is an apocalyptic number.

It is an amenable number.

7942247817 is a deficient number, since it is larger than the sum of its proper divisors (4923395703).

7942247817 is a wasteful number, since it uses less digits than its factorization.

7942247817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197213.

The product of its digits is 1580544, while the sum is 51.

The square root of 7942247817 is about 89119.2898142708. The cubic root of 7942247817 is about 1995.1756904588.

The spelling of 7942247817 in words is "seven billion, nine hundred forty-two million, two hundred forty-seven thousand, eight hundred seventeen".