405603 has 24 divisors (see below), whose sum is σ = 679536. Its totient is φ = 230400.

The previous prime is 405599. The next prime is 405607. The reversal of 405603 is 306504.

It is a happy number.

405603 is nontrivially palindromic in base 2.

It is an interprime number because it is at equal distance from previous prime (405599) and next prime (405607).

It is not a de Polignac number, because 405603 - 2² = 405599 is a prime.

It is a D-number.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (405607) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1563 + ... + 1803.

It is an arithmetic number, because the mean of its divisors is an integer number (28314).

2⁴⁰⁵⁶⁰³ is an apocalyptic number.

405603 is a deficient number, since it is larger than the sum of its proper divisors (273933).

405603 is a wasteful number, since it uses less digits than its factorization.

405603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275 (or 272 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 405603 is about 636.8696883979. The cubic root of 405603 is about 74.0230631789.

Subtracting from 405603 its reverse (306504), we obtain a palindrome (99099).

The spelling of 405603 in words is "four hundred five thousand, six hundred three".