428681947 has 2 divisors, whose sum is σ = 428681948. Its totient is φ = 428681946.

The previous prime is 428681927. The next prime is 428681999. The reversal of 428681947 is 749186824.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 428681947 - 2¹⁹ = 428157659 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 428681947.

It is not a weakly prime, because it can be changed into another prime (428681917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214340973 + 214340974.

It is an arithmetic number, because the mean of its divisors is an integer number (214340974).

Almost surely, 2^428681947 is an apocalyptic number.

428681947 is a deficient number, since it is larger than the sum of its proper divisors (1).

428681947 is an equidigital number, since it uses as much as digits as its factorization.

428681947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 774144, while the sum is 49.

The square root of 428681947 is about 20704.6358818502. The cubic root of 428681947 is about 754.0122439596.

The spelling of 428681947 in words is "four hundred twenty-eight million, six hundred eighty-one thousand, nine hundred forty-seven".