203009 has 4 divisors (see below), whose sum is σ = 205380. Its totient is φ = 200640.

The previous prime is 202999. The next prime is 203011. The reversal of 203009 is 900302.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 78400 + 124609 = 280^2 + 353^2 .

It is a cyclic number.

It is not a de Polignac number, because 203009 - 2⁸ = 202753 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202984 and 203002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203039) 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, 1052 + ... + 1229.

It is an arithmetic number, because the mean of its divisors is an integer number (51345).

2²⁰³⁰⁰⁹ is an apocalyptic number.

It is an amenable number.

203009 is a deficient number, since it is larger than the sum of its proper divisors (2371).

203009 is an equidigital number, since it uses as much as digits as its factorization.

203009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2370.

The product of its (nonzero) digits is 54, while the sum is 14.

The square root of 203009 is about 450.5652006092. The cubic root of 203009 is about 58.7721751207.

The spelling of 203009 in words is "two hundred three thousand, nine".