405594 has 64 divisors (see below), whose sum is σ = 1094400. Its totient is φ = 108864.

The previous prime is 405577. The next prime is 405599. The reversal of 405594 is 495504.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405599) by changing a digit.

405594 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10944 + ... + 10980.

It is an arithmetic number, because the mean of its divisors is an integer number (17100).

2⁴⁰⁵⁵⁹⁴ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 405594, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (547200).

405594 is an abundant number, since it is smaller than the sum of its proper divisors (688806).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

405594 is a wasteful number, since it uses less digits than its factorization.

405594 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84 (or 78 counting only the distinct ones).

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

The square root of 405594 is about 636.8626225490. The cubic root of 405594 is about 74.0225156711.

It can be divided in two parts, 405 and 594, that added together give a palindrome (999).

The spelling of 405594 in words is "four hundred five thousand, five hundred ninety-four".