428207947 has 2 divisors, whose sum is σ = 428207948. Its totient is φ = 428207946.

The previous prime is 428207933. The next prime is 428208031. The reversal of 428207947 is 749702824.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-428207947 is a prime.

It is not a weakly prime, because it can be changed into another prime (428237947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214103973 + 214103974.

It is an arithmetic number, because the mean of its divisors is an integer number (214103974).

Almost surely, 2^428207947 is an apocalyptic number.

428207947 is a deficient number, since it is larger than the sum of its proper divisors (1).

428207947 is an equidigital number, since it uses as much as digits as its factorization.

428207947 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 225792, while the sum is 43.

The square root of 428207947 is about 20693.1860040932. The cubic root of 428207947 is about 753.7342339530.

The spelling of 428207947 in words is "four hundred twenty-eight million, two hundred seven thousand, nine hundred forty-seven".