405489 has 8 divisors (see below), whose sum is σ = 617920. Its totient is φ = 231696.

The previous prime is 405487. The next prime is 405491. The reversal of 405489 is 984504.

It is an interprime number because it is at equal distance from previous prime (405487) and next prime (405491).

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

It is not a de Polignac number, because 405489 - 2¹ = 405487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (405487) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9634 + ... + 9675.

It is an arithmetic number, because the mean of its divisors is an integer number (77240).

2⁴⁰⁵⁴⁸⁹ is an apocalyptic number.

It is an amenable number.

405489 is a deficient number, since it is larger than the sum of its proper divisors (212431).

405489 is a wasteful number, since it uses less digits than its factorization.

405489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19319.

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 405489 is about 636.7801818524. The cubic root of 405489 is about 74.0161274808.

The spelling of 405489 in words is "four hundred five thousand, four hundred eighty-nine".