421839 has 12 divisors (see below), whose sum is σ = 664872. Its totient is φ = 255600.

The previous prime is 421831. The next prime is 421847. The reversal of 421839 is 938124.

It is an interprime number because it is at equal distance from previous prime (421831) and next prime (421847).

It is not a de Polignac number, because 421839 - 2³ = 421831 is a prime.

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 polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2032 + ... + 2229.

It is an arithmetic number, because the mean of its divisors is an integer number (55406).

2⁴²¹⁸³⁹ is an apocalyptic number.

421839 is a deficient number, since it is larger than the sum of its proper divisors (243033).

421839 is a wasteful number, since it uses less digits than its factorization.

421839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4278 (or 4275 counting only the distinct ones).

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

The square root of 421839 is about 649.4913394342. The cubic root of 421839 is about 74.9978666060.

It can be divided in two parts, 42 and 1839, that added together give a palindrome (1881).

The spelling of 421839 in words is "four hundred twenty-one thousand, eight hundred thirty-nine".