421239 has 16 divisors (see below), whose sum is σ = 691712. Its totient is φ = 222048.

The previous prime is 421207. The next prime is 421241. The reversal of 421239 is 932124.

It is not a de Polignac number, because 421239 - 2⁵ = 421207 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

421239 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421279) 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 15 ways as a sum of consecutive naturals, for example, 499 + ... + 1044.

It is an arithmetic number, because the mean of its divisors is an integer number (43232).

2⁴²¹²³⁹ is an apocalyptic number.

421239 is a deficient number, since it is larger than the sum of its proper divisors (270473).

421239 is a wasteful number, since it uses less digits than its factorization.

421239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1566.

The product of its digits is 432, while the sum is 21.

The square root of 421239 is about 649.0292751487. The cubic root of 421239 is about 74.9622921559.

The spelling of 421239 in words is "four hundred twenty-one thousand, two hundred thirty-nine".