405943 has 4 divisors (see below), whose sum is σ = 429840. Its totient is φ = 382048.

The previous prime is 405917. The next prime is 405947. The reversal of 405943 is 349504.

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 405943 - 2¹³ = 397751 is a prime.

It is a d-powerful number, because it can be written as 4³ + 0 + 9⁴ + 5⁷ + 4⁹ + 3¹⁰ .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405947) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 11923 + ... + 11956.

It is an arithmetic number, because the mean of its divisors is an integer number (107460).

2⁴⁰⁵⁹⁴³ is an apocalyptic number.

405943 is a deficient number, since it is larger than the sum of its proper divisors (23897).

405943 is a wasteful number, since it uses less digits than its factorization.

405943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23896.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 405943 is about 637.1365630695. The cubic root of 405943 is about 74.0437408797.

The spelling of 405943 in words is "four hundred five thousand, nine hundred forty-three".