421439 has 8 divisors (see below), whose sum is σ = 455280. Its totient is φ = 388800.

The previous prime is 421433. The next prime is 421453. The reversal of 421439 is 934124.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 421439 - 2⁴ = 421423 is a prime.

It is a super-2 number, since 2×421439² = 355221661442, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421433) 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, 509 + ... + 1049.

It is an arithmetic number, because the mean of its divisors is an integer number (56910).

2⁴²¹⁴³⁹ is an apocalyptic number.

421439 is a deficient number, since it is larger than the sum of its proper divisors (33841).

421439 is a wasteful number, since it uses less digits than its factorization.

421439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 601.

The product of its digits is 864, while the sum is 23.

The square root of 421439 is about 649.1833331194. The cubic root of 421439 is about 74.9741540571.

The spelling of 421439 in words is "four hundred twenty-one thousand, four hundred thirty-nine".