405591 has 4 divisors (see below), whose sum is σ = 540792. Its totient is φ = 270392.

The previous prime is 405577. The next prime is 405599. The reversal of 405591 is 195504.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 405591 - 2⁶ = 405527 is a prime.

It is a D-number.

It is a plaindrome in base 11.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 405591.

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67596 + ... + 67601.

It is an arithmetic number, because the mean of its divisors is an integer number (135198).

2⁴⁰⁵⁵⁹¹ is an apocalyptic number.

405591 is a deficient number, since it is larger than the sum of its proper divisors (135201).

405591 is a wasteful number, since it uses less digits than its factorization.

405591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135200.

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 405591 is about 636.8602672486. The cubic root of 405591 is about 74.0223331667.

The spelling of 405591 in words is "four hundred five thousand, five hundred ninety-one".