7947940991 has 8 divisors (see below), whose sum is σ = 8134374864. Its totient is φ = 7761579840.

The previous prime is 7947940961. The next prime is 7947941009. The reversal of 7947940991 is 1990497497.

7947940991 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7947940991 is a prime.

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 7947940991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7947940961) 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, 248105 + ... + 278301.

It is an arithmetic number, because the mean of its divisors is an integer number (1016796858).

Almost surely, 2^7947940991 is an apocalyptic number.

7947940991 is a deficient number, since it is larger than the sum of its proper divisors (186433873).

7947940991 is a wasteful number, since it uses less digits than its factorization.

7947940991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36361.

The product of its (nonzero) digits is 5143824, while the sum is 59.

The square root of 7947940991 is about 89151.2254038047. The cubic root of 7947940991 is about 1995.6523048720.

The spelling of 7947940991 in words is "seven billion, nine hundred forty-seven million, nine hundred forty thousand, nine hundred ninety-one".