428242009 has 8 divisors (see below), whose sum is σ = 462010752. Its totient is φ = 394591440.

The previous prime is 428241997. The next prime is 428242027. The reversal of 428242009 is 900242824.

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 428242009 - 2⁵ = 428241977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (428242039) 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, 21937 + ... + 36574.

It is an arithmetic number, because the mean of its divisors is an integer number (57751344).

Almost surely, 2^428242009 is an apocalyptic number.

It is an amenable number.

428242009 is a deficient number, since it is larger than the sum of its proper divisors (33768743).

428242009 is a wasteful number, since it uses less digits than its factorization.

428242009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59087.

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 428242009 is about 20694.0090122721. The cubic root of 428242009 is about 753.7542188030.

The spelling of 428242009 in words is "four hundred twenty-eight million, two hundred forty-two thousand, nine".