428355021 has 8 divisors (see below), whose sum is σ = 578964160. Its totient is φ = 281657952.

The previous prime is 428354989. The next prime is 428355071. The reversal of 428355021 is 120553824.

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

It is not a de Polignac number, because 428355021 - 2⁵ = 428354989 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 428355021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428355071) 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, 977761 + ... + 978198.

It is an arithmetic number, because the mean of its divisors is an integer number (72370520).

Almost surely, 2^428355021 is an apocalyptic number.

It is an amenable number.

428355021 is a deficient number, since it is larger than the sum of its proper divisors (150609139).

428355021 is a wasteful number, since it uses less digits than its factorization.

428355021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1956035.

The product of its (nonzero) digits is 9600, while the sum is 30.

The square root of 428355021 is about 20696.7393808783. The cubic root of 428355021 is about 753.8205175919.

The spelling of 428355021 in words is "four hundred twenty-eight million, three hundred fifty-five thousand, twenty-one".