405903 has 4 divisors (see below), whose sum is σ = 541208. Its totient is φ = 270600.

The previous prime is 405901. The next prime is 405917. The reversal of 405903 is 309504.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 405903 - 2¹ = 405901 is a prime.

It is a D-number.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 405903.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 405903.

It is not an unprimeable number, because it can be changed into a prime (405901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67648 + ... + 67653.

It is an arithmetic number, because the mean of its divisors is an integer number (135302).

2⁴⁰⁵⁹⁰³ is an apocalyptic number.

405903 is a deficient number, since it is larger than the sum of its proper divisors (135305).

405903 is a wasteful number, since it uses less digits than its factorization.

405903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135304.

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 405903 is about 637.1051718516. The cubic root of 405903 is about 74.0413088084.

The spelling of 405903 in words is "four hundred five thousand, nine hundred three".