428843509 has 8 divisors (see below), whose sum is σ = 451608480. Its totient is φ = 406098000.

The previous prime is 428843507. The next prime is 428843531. The reversal of 428843509 is 905348824.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 428843509 - 2¹ = 428843507 is a prime.

It is a super-2 number, since 2×428843509² = 367813510422866162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428843501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70239 + ... + 76099.

It is an arithmetic number, because the mean of its divisors is an integer number (56451060).

Almost surely, 2^428843509 is an apocalyptic number.

It is an amenable number.

428843509 is a deficient number, since it is larger than the sum of its proper divisors (22764971).

428843509 is a wasteful number, since it uses less digits than its factorization.

428843509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9731.

The product of its (nonzero) digits is 276480, while the sum is 43.

The square root of 428843509 is about 20708.5371042959. The cubic root of 428843509 is about 754.1069563110.

The spelling of 428843509 in words is "four hundred twenty-eight million, eight hundred forty-three thousand, five hundred nine".