489409 has 2 divisors, whose sum is σ = 489410. Its totient is φ = 489408.

The previous prime is 489407. The next prime is 489427. The reversal of 489409 is 904984.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 485809 + 3600 = 697^2 + 60^2 .

It is a cyclic number.

It is not a de Polignac number, because 489409 - 2¹ = 489407 is a prime.

Together with 489407, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (489407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 244704 + 244705.

It is an arithmetic number, because the mean of its divisors is an integer number (244705).

2⁴⁸⁹⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

489409 is a deficient number, since it is larger than the sum of its proper divisors (1).

489409 is an equidigital number, since it uses as much as digits as its factorization.

489409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 489409 is about 699.5777297770. The cubic root of 489409 is about 78.8056430463.

It can be divided in two parts, 489 and 409, that added together give a palindrome (898).

The spelling of 489409 in words is "four hundred eighty-nine thousand, four hundred nine".