439409 has 2 divisors, whose sum is σ = 439410. Its totient is φ = 439408.

The previous prime is 439381. The next prime is 439421. The reversal of 439409 is 904934.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 327184 + 112225 = 572^2 + 335^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-439409 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (439429) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 219704 + 219705.

It is an arithmetic number, because the mean of its divisors is an integer number (219705).

2⁴³⁹⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

439409 is a deficient number, since it is larger than the sum of its proper divisors (1).

439409 is an equidigital number, since it uses as much as digits as its factorization.

439409 is an evil number, because the sum of its binary digits is even.

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

The square root of 439409 is about 662.8793253677. The cubic root of 439409 is about 76.0249802464.

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

The spelling of 439409 in words is "four hundred thirty-nine thousand, four hundred nine".