421939 has 12 divisors (see below), whose sum is σ = 501600. Its totient is φ = 353808.

The previous prime is 421913. The next prime is 421943. The reversal of 421939 is 939124.

It is a happy number.

It is not a de Polignac number, because 421939 - 2⁵ = 421907 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (421339) 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, 3817 + ... + 3925.

It is an arithmetic number, because the mean of its divisors is an integer number (41800).

2⁴²¹⁹³⁹ is an apocalyptic number.

421939 is a gapful number since it is divisible by the number (49) formed by its first and last digit.

421939 is a deficient number, since it is larger than the sum of its proper divisors (79661).

421939 is a wasteful number, since it uses less digits than its factorization.

421939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202 (or 195 counting only the distinct ones).

The product of its digits is 1944, while the sum is 28.

The square root of 421939 is about 649.5683181929. The cubic root of 421939 is about 75.0037924008.

The spelling of 421939 in words is "four hundred twenty-one thousand, nine hundred thirty-nine".