406003 has 4 divisors (see below), whose sum is σ = 437248. Its totient is φ = 374760.

The previous prime is 405997. The next prime is 406013. The reversal of 406003 is 300604.

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 406003 - 2⁹ = 405491 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 31231 = 406003 / (4 + 0 + 6 + 0 + 0 + 3).

It is a Duffinian number.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (406013) 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, 15603 + ... + 15628.

It is an arithmetic number, because the mean of its divisors is an integer number (109312).

2⁴⁰⁶⁰⁰³ is an apocalyptic number.

406003 is a deficient number, since it is larger than the sum of its proper divisors (31245).

406003 is a wasteful number, since it uses less digits than its factorization.

406003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31244.

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 406003 is about 637.1836469967. The cubic root of 406003 is about 74.0473886871.

Adding to 406003 its reverse (300604), we get a palindrome (706607).

The spelling of 406003 in words is "four hundred six thousand, three".