13826309 has 4 divisors (see below), whose sum is σ = 15801504. Its totient is φ = 11851116.

The previous prime is 13826303. The next prime is 13826311. The reversal of 13826309 is 90362831.

13826309 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13826309 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 (13826303) 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, 987587 + ... + 987600.

It is an arithmetic number, because the mean of its divisors is an integer number (3950376).

Almost surely, 2^13826309 is an apocalyptic number.

It is an amenable number.

13826309 is a deficient number, since it is larger than the sum of its proper divisors (1975195).

13826309 is an equidigital number, since it uses as much as digits as its factorization.

13826309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1975194.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 13826309 is about 3718.3745104548. The cubic root of 13826309 is about 240.0133615246.

The spelling of 13826309 in words is "thirteen million, eight hundred twenty-six thousand, three hundred nine".