13403309 has 4 divisors (see below), whose sum is σ = 13592160. Its totient is φ = 13214460.

The previous prime is 13403297. The next prime is 13403317. The reversal of 13403309 is 90330431.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90330431 = 37 ⋅2441363.

It is a cyclic number.

It is not a de Polignac number, because 13403309 - 2⁸ = 13403053 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 (13403399) 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, 94319 + ... + 94460.

It is an arithmetic number, because the mean of its divisors is an integer number (3398040).

Almost surely, 2^13403309 is an apocalyptic number.

It is an amenable number.

13403309 is a deficient number, since it is larger than the sum of its proper divisors (188851).

13403309 is an equidigital number, since it uses as much as digits as its factorization.

13403309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188850.

The product of its (nonzero) digits is 972, while the sum is 23.

The square root of 13403309 is about 3661.0529906026. The cubic root of 13403309 is about 237.5403233473.

The spelling of 13403309 in words is "thirteen million, four hundred three thousand, three hundred nine".