428571409 has 8 divisors (see below), whose sum is σ = 499037760. Its totient is φ = 360415536.

The previous prime is 428571389. The next prime is 428571431. The reversal of 428571409 is 904175824.

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 428571409 - 2¹⁵ = 428538641 is a prime.

It is a super-2 number, since 2×428571409² = 367346905224490562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (428571449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 577219 + ... + 577960.

It is an arithmetic number, because the mean of its divisors is an integer number (62379720).

Almost surely, 2^428571409 is an apocalyptic number.

It is an amenable number.

428571409 is a deficient number, since it is larger than the sum of its proper divisors (70466351).

428571409 is a wasteful number, since it uses less digits than its factorization.

428571409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1155239.

The product of its (nonzero) digits is 80640, while the sum is 40.

The square root of 428571409 is about 20701.9663075757. The cubic root of 428571409 is about 753.9474296524.

The spelling of 428571409 in words is "four hundred twenty-eight million, five hundred seventy-one thousand, four hundred nine".