428018 has 4 divisors (see below), whose sum is σ = 642030. Its totient is φ = 214008.

The previous prime is 428003. The next prime is 428023. The reversal of 428018 is 810824.

428018 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in only one way, i.e., 418609 + 9409 = 647^2 + 97^2 .

It is a junction number, because it is equal to n+sod(n) for n = 427984 and 428002.

It is an unprimeable number.

428018 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107003 + ... + 107006.

2⁴²⁸⁰¹⁸ is an apocalyptic number.

428018 is a deficient number, since it is larger than the sum of its proper divisors (214012).

428018 is a wasteful number, since it uses less digits than its factorization.

428018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214011.

The product of its (nonzero) digits is 512, while the sum is 23.

The square root of 428018 is about 654.2308461086. The cubic root of 428018 is about 75.3622768848.

The spelling of 428018 in words is "four hundred twenty-eight thousand, eighteen".