428020427 has 2 divisors, whose sum is σ = 428020428. Its totient is φ = 428020426.

The previous prime is 428020349. The next prime is 428020471. The reversal of 428020427 is 724020824.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 428020427 - 2²⁰ = 426971851 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 428020427.

It is not a weakly prime, because it can be changed into another prime (428320427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214010213 + 214010214.

It is an arithmetic number, because the mean of its divisors is an integer number (214010214).

Almost surely, 2^428020427 is an apocalyptic number.

428020427 is a deficient number, since it is larger than the sum of its proper divisors (1).

428020427 is an equidigital number, since it uses as much as digits as its factorization.

428020427 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7168, while the sum is 29.

The square root of 428020427 is about 20688.6545478434. The cubic root of 428020427 is about 753.6241932735.

The spelling of 428020427 in words is "four hundred twenty-eight million, twenty thousand, four hundred twenty-seven".