405445 has 8 divisors (see below), whose sum is σ = 491040. Its totient is φ = 321360.

The previous prime is 405439. The next prime is 405473. The reversal of 405445 is 544504.

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

It is not a de Polignac number, because 405445 - 2³ = 405437 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 346 + ... + 964.

It is an arithmetic number, because the mean of its divisors is an integer number (61380).

2⁴⁰⁵⁴⁴⁵ is an apocalyptic number.

It is an amenable number.

405445 is a deficient number, since it is larger than the sum of its proper divisors (85595).

405445 is a wasteful number, since it uses less digits than its factorization.

405445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 755.

The product of its (nonzero) digits is 1600, while the sum is 22.

The square root of 405445 is about 636.7456321012. The cubic root of 405445 is about 74.0134501970.

Adding to 405445 its reverse (544504), we get a palindrome (949949).

The spelling of 405445 in words is "four hundred five thousand, four hundred forty-five".