421028 has 12 divisors (see below), whose sum is σ = 748272. Its totient is φ = 207240.

The previous prime is 421019. The next prime is 421033. The reversal of 421028 is 820124.

It is a junction number, because it is equal to n+sod(n) for n = 420997 and 421015.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 421028.

It is an unprimeable number.

421028 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 518 + ... + 1053.

It is an arithmetic number, because the mean of its divisors is an integer number (62356).

2⁴²¹⁰²⁸ is an apocalyptic number.

It is an amenable number.

421028 is a deficient number, since it is larger than the sum of its proper divisors (327244).

421028 is a wasteful number, since it uses less digits than its factorization.

421028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1642 (or 1640 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 421028 is about 648.8667043392. The cubic root of 421028 is about 74.9497737793.

The spelling of 421028 in words is "four hundred twenty-one thousand, twenty-eight".