409903 has 4 divisors (see below), whose sum is σ = 441448. Its totient is φ = 378360.

The previous prime is 409901. The next prime is 409909. The reversal of 409903 is 309904.

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 409903 - 2¹ = 409901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (409901) 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, 15753 + ... + 15778.

It is an arithmetic number, because the mean of its divisors is an integer number (110362).

2⁴⁰⁹⁹⁰³ is an apocalyptic number.

409903 is a deficient number, since it is larger than the sum of its proper divisors (31545).

409903 is a wasteful number, since it uses less digits than its factorization.

409903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31544.

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 409903 is about 640.2366749882. The cubic root of 409903 is about 74.2837293426.

Subtracting from 409903 its reverse (309904), we obtain a palindrome (99999).

The spelling of 409903 in words is "four hundred nine thousand, nine hundred three".