203445 has 32 divisors (see below), whose sum is σ = 397440. Its totient is φ = 97920.

The previous prime is 203431. The next prime is 203449. The reversal of 203445 is 544302.

It is a happy number.

203445 is nontrivially palindromic in base 12.

It is not a de Polignac number, because 203445 - 2⁴ = 203429 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203449) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1417 + ... + 1553.

It is an arithmetic number, because the mean of its divisors is an integer number (12420).

2²⁰³⁴⁴⁵ is an apocalyptic number.

It is an amenable number.

203445 is a deficient number, since it is larger than the sum of its proper divisors (193995).

203445 is a wasteful number, since it uses less digits than its factorization.

203445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162 (or 156 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 18.

The square root of 203445 is about 451.0487778500. The cubic root of 203445 is about 58.8142198012.

Adding to 203445 its reverse (544302), we get a palindrome (747747).

The spelling of 203445 in words is "two hundred three thousand, four hundred forty-five".