421893 has 6 divisors (see below), whose sum is σ = 609414. Its totient is φ = 281256.

The previous prime is 421891. The next prime is 421907. The reversal of 421893 is 398124.

It can be written as a sum of positive squares in only one way, i.e., 248004 + 173889 = 498^2 + 417^2 .

It is not a de Polignac number, because 421893 - 2¹ = 421891 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 23430 + ... + 23447.

It is an arithmetic number, because the mean of its divisors is an integer number (101569).

2⁴²¹⁸⁹³ is an apocalyptic number.

It is an amenable number.

421893 is a deficient number, since it is larger than the sum of its proper divisors (187521).

421893 is a wasteful number, since it uses less digits than its factorization.

421893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46883 (or 46880 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 421893 is about 649.5329090970. The cubic root of 421893 is about 75.0010666515.

The spelling of 421893 in words is "four hundred twenty-one thousand, eight hundred ninety-three".