7947427 has 2 divisors, whose sum is σ = 7947428. Its totient is φ = 7947426.

The previous prime is 7947409. The next prime is 7947431. The reversal of 7947427 is 7247497.

It is a strong prime.

It is an emirp because it is prime and its reverse (7247497) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7947427 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7947427.

It is not a weakly prime, because it can be changed into another prime (7947487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3973713 + 3973714.

It is an arithmetic number, because the mean of its divisors is an integer number (3973714).

Almost surely, 2^7947427 is an apocalyptic number.

7947427 is a deficient number, since it is larger than the sum of its proper divisors (1).

7947427 is an equidigital number, since it uses as much as digits as its factorization.

7947427 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 98784, while the sum is 40.

The square root of 7947427 is about 2819.1181245205. The cubic root of 7947427 is about 199.5609284529.

The spelling of 7947427 in words is "seven million, nine hundred forty-seven thousand, four hundred twenty-seven".