421838 has 16 divisors (see below), whose sum is σ = 706320. Its totient is φ = 187776.

The previous prime is 421831. The next prime is 421847. The reversal of 421838 is 838124.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421831) 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 in 7 ways as a sum of consecutive naturals, for example, 320 + ... + 972.

It is an arithmetic number, because the mean of its divisors is an integer number (44145).

2⁴²¹⁸³⁸ is an apocalyptic number.

421838 is a deficient number, since it is larger than the sum of its proper divisors (284482).

421838 is a wasteful number, since it uses less digits than its factorization.

421838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 691.

The product of its digits is 1536, while the sum is 26.

The square root of 421838 is about 649.4905696005. The cubic root of 421838 is about 74.9978073433.

The spelling of 421838 in words is "four hundred twenty-one thousand, eight hundred thirty-eight".