428809441 has 2 divisors, whose sum is σ = 428809442. Its totient is φ = 428809440.

The previous prime is 428809439. The next prime is 428809471. The reversal of 428809441 is 144908824.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 427662400 + 1147041 = 20680^2 + 1071^2 .

It is a cyclic number.

It is not a de Polignac number, because 428809441 - 2¹ = 428809439 is a prime.

Together with 428809439, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 428809394 and 428809403.

It is not a weakly prime, because it can be changed into another prime (428809421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214404720 + 214404721.

It is an arithmetic number, because the mean of its divisors is an integer number (214404721).

Almost surely, 2^428809441 is an apocalyptic number.

It is an amenable number.

428809441 is a deficient number, since it is larger than the sum of its proper divisors (1).

428809441 is an equidigital number, since it uses as much as digits as its factorization.

428809441 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 73728, while the sum is 40.

The square root of 428809441 is about 20707.7145286485. The cubic root of 428809441 is about 754.0869866363.

The spelling of 428809441 in words is "four hundred twenty-eight million, eight hundred nine thousand, four hundred forty-one".