405545 has 8 divisors (see below), whose sum is σ = 556224. Its totient is φ = 278064.

The previous prime is 405541. The next prime is 405553. The reversal of 405545 is 545504.

405545 = T₃₀ + T₃₁ + ... + T₁₃₄.

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

It is a cyclic number.

It is not a de Polignac number, because 405545 - 2² = 405541 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 405545.

It is not an unprimeable number, because it can be changed into a prime (405541) 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 7 ways as a sum of consecutive naturals, for example, 5759 + ... + 5828.

It is an arithmetic number, because the mean of its divisors is an integer number (69528).

2⁴⁰⁵⁵⁴⁵ is an apocalyptic number.

It is an amenable number.

405545 is a deficient number, since it is larger than the sum of its proper divisors (150679).

405545 is a wasteful number, since it uses less digits than its factorization.

405545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11599.

The product of its (nonzero) digits is 2000, while the sum is 23.

The square root of 405545 is about 636.8241515521. The cubic root of 405545 is about 74.0195346528.

The spelling of 405545 in words is "four hundred five thousand, five hundred forty-five".