409545 has 24 divisors (see below), whose sum is σ = 748800. Its totient is φ = 206496.

The previous prime is 409543. The next prime is 409573. The reversal of 409545 is 545904.

409545 is nontrivially palindromic in base 4.

It is not a de Polignac number, because 409545 - 2¹ = 409543 is a prime.

It is not an unprimeable number, because it can be changed into a prime (409543) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 616 + ... + 1094.

It is an arithmetic number, because the mean of its divisors is an integer number (31200).

2⁴⁰⁹⁵⁴⁵ is an apocalyptic number.

409545 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

409545 is a deficient number, since it is larger than the sum of its proper divisors (339255).

409545 is a wasteful number, since it uses less digits than its factorization.

409545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 509 (or 506 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 409545 is about 639.9570298075. The cubic root of 409545 is about 74.2620971345.

The spelling of 409545 in words is "four hundred nine thousand, five hundred forty-five".