13203445 has 4 divisors (see below), whose sum is σ = 15844140. Its totient is φ = 10562752.

The previous prime is 13203431. The next prime is 13203457. The reversal of 13203445 is 54430231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54430231 = 19 ⋅2864749.

It can be written as a sum of positive squares in 2 ways, for example, as 10510564 + 2692881 = 3242^2 + 1641^2 .

It is a cyclic number.

It is not a de Polignac number, because 13203445 - 2⁷ = 13203317 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1320340 + ... + 1320349.

It is an arithmetic number, because the mean of its divisors is an integer number (3961035).

Almost surely, 2^13203445 is an apocalyptic number.

It is an amenable number.

13203445 is a deficient number, since it is larger than the sum of its proper divisors (2640695).

13203445 is an equidigital number, since it uses as much as digits as its factorization.

13203445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2640694.

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 13203445 is about 3633.6544965090. The cubic root of 13203445 is about 236.3537080956.

Adding to 13203445 its reverse (54430231), we get a palindrome (67633676).

The spelling of 13203445 in words is "thirteen million, two hundred three thousand, four hundred forty-five".