421828 has 12 divisors (see below), whose sum is σ = 805392. Its totient is φ = 191720.

The previous prime is 421807. The next prime is 421831. The reversal of 421828 is 828124.

It is an unprimeable 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 in 3 ways as a sum of consecutive naturals, for example, 4750 + ... + 4837.

It is an arithmetic number, because the mean of its divisors is an integer number (67116).

2⁴²¹⁸²⁸ is an apocalyptic number.

It is an amenable number.

421828 is a deficient number, since it is larger than the sum of its proper divisors (383564).

421828 is a wasteful number, since it uses less digits than its factorization.

421828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9602 (or 9600 counting only the distinct ones).

The product of its digits is 1024, while the sum is 25.

The square root of 421828 is about 649.4828712137. The cubic root of 421828 is about 74.9972147114.

The spelling of 421828 in words is "four hundred twenty-one thousand, eight hundred twenty-eight".