405745 has 8 divisors (see below), whose sum is σ = 512640. Its totient is φ = 307440.

The previous prime is 405731. The next prime is 405749. The reversal of 405745 is 547504.

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

It is a de Polignac number, because none of the positive numbers 2^k-405745 is a prime.

405745 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (405749) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2041 + ... + 2230.

It is an arithmetic number, because the mean of its divisors is an integer number (64080).

2⁴⁰⁵⁷⁴⁵ is an apocalyptic number.

It is an amenable number.

405745 is a deficient number, since it is larger than the sum of its proper divisors (106895).

405745 is a wasteful number, since it uses less digits than its factorization.

405745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4295.

The product of its (nonzero) digits is 2800, while the sum is 25.

The square root of 405745 is about 636.9811614169. The cubic root of 405745 is about 74.0317005646.

The spelling of 405745 in words is "four hundred five thousand, seven hundred forty-five".