421628 has 6 divisors (see below), whose sum is σ = 737856. Its totient is φ = 210812.

The previous prime is 421621. The next prime is 421633. The reversal of 421628 is 826124.

421628 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52700 + ... + 52707.

It is an arithmetic number, because the mean of its divisors is an integer number (122976).

2⁴²¹⁶²⁸ is an apocalyptic number.

It is an amenable number.

421628 is a deficient number, since it is larger than the sum of its proper divisors (316228).

421628 is a wasteful number, since it uses less digits than its factorization.

421628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105411 (or 105409 counting only the distinct ones).

The product of its digits is 768, while the sum is 23.

The square root of 421628 is about 649.3288843106. The cubic root of 421628 is about 74.9853601055.

Subtracting 421628 from its reverse (826124), we obtain a square (404496 = 636²).

The spelling of 421628 in words is "four hundred twenty-one thousand, six hundred twenty-eight".