409439 has 4 divisors (see below), whose sum is σ = 414456. Its totient is φ = 404424.

The previous prime is 409433. The next prime is 409441. The reversal of 409439 is 934904.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 409439 - 2¹² = 405343 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (409433) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2384 + ... + 2549.

It is an arithmetic number, because the mean of its divisors is an integer number (103614).

2⁴⁰⁹⁴³⁹ is an apocalyptic number.

409439 is a deficient number, since it is larger than the sum of its proper divisors (5017).

409439 is an equidigital number, since it uses as much as digits as its factorization.

409439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5016.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 409439 is about 639.8742063875. The cubic root of 409439 is about 74.2556896485.

It can be divided in two parts, 409 and 439, that added together give a palindrome (848).

The spelling of 409439 in words is "four hundred nine thousand, four hundred thirty-nine".