405539 has 4 divisors (see below), whose sum is σ = 407256. Its totient is φ = 403824.

The previous prime is 405529. The next prime is 405541. The reversal of 405539 is 935504.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-405539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (405529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 434 + ... + 999.

It is an arithmetic number, because the mean of its divisors is an integer number (101814).

2⁴⁰⁵⁵³⁹ is an apocalyptic number.

405539 is a deficient number, since it is larger than the sum of its proper divisors (1717).

405539 is a wasteful number, since it uses less digits than its factorization.

405539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1716.

The product of its (nonzero) digits is 2700, while the sum is 26.

The square root of 405539 is about 636.8194406580. The cubic root of 405539 is about 74.0191696137.

The spelling of 405539 in words is "four hundred five thousand, five hundred thirty-nine".