428609 has 4 divisors (see below), whose sum is σ = 432516. Its totient is φ = 424704.

The previous prime is 428579. The next prime is 428629. The reversal of 428609 is 906824.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 34225 + 394384 = 185^2 + 628^2 .

It is a cyclic number.

It is not a de Polignac number, because 428609 - 2⁸ = 428353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (428629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1784 + ... + 2009.

It is an arithmetic number, because the mean of its divisors is an integer number (108129).

2⁴²⁸⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

428609 is a deficient number, since it is larger than the sum of its proper divisors (3907).

428609 is a wasteful number, since it uses less digits than its factorization.

428609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3906.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 428609 is about 654.6823657317. The cubic root of 428609 is about 75.3969472505.

The spelling of 428609 in words is "four hundred twenty-eight thousand, six hundred nine".