428489 has 2 divisors, whose sum is σ = 428490. Its totient is φ = 428488.

The previous prime is 428473. The next prime is 428503. The reversal of 428489 is 984824.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 284089 + 144400 = 533^2 + 380^2 .

It is a cyclic number.

It is not a de Polignac number, because 428489 - 2⁴ = 428473 is a prime.

It is not a weakly prime, because it can be changed into another prime (428429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214244 + 214245.

It is an arithmetic number, because the mean of its divisors is an integer number (214245).

2⁴²⁸⁴⁸⁹ is an apocalyptic number.

It is an amenable number.

428489 is a deficient number, since it is larger than the sum of its proper divisors (1).

428489 is an equidigital number, since it uses as much as digits as its factorization.

428489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18432, while the sum is 35.

The square root of 428489 is about 654.5907118192. The cubic root of 428489 is about 75.3899101622.

The spelling of 428489 in words is "four hundred twenty-eight thousand, four hundred eighty-nine".