428820841 has 2 divisors, whose sum is σ = 428820842. Its totient is φ = 428820840.

The previous prime is 428820839. The next prime is 428820853. The reversal of 428820841 is 148028824.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 248724441 + 180096400 = 15771^2 + 13420^2 .

It is a cyclic number.

It is not a de Polignac number, because 428820841 - 2¹ = 428820839 is a prime.

Together with 428820839, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 428820841.

It is not a weakly prime, because it can be changed into another prime (428820881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214410420 + 214410421.

It is an arithmetic number, because the mean of its divisors is an integer number (214410421).

Almost surely, 2^428820841 is an apocalyptic number.

It is an amenable number.

428820841 is a deficient number, since it is larger than the sum of its proper divisors (1).

428820841 is an equidigital number, since it uses as much as digits as its factorization.

428820841 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32768, while the sum is 37.

The square root of 428820841 is about 20707.9897865534. The cubic root of 428820841 is about 754.0936691038.

The spelling of 428820841 in words is "four hundred twenty-eight million, eight hundred twenty thousand, eight hundred forty-one".