13820909 has 4 divisors (see below), whose sum is σ = 13920480. Its totient is φ = 13721340.

The previous prime is 13820903. The next prime is 13820957. The reversal of 13820909 is 90902831.

13820909 is digitally balanced in base 3, 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-13820909 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 (13820903) 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, 49577 + ... + 49854.

It is an arithmetic number, because the mean of its divisors is an integer number (3480120).

Almost surely, 2^13820909 is an apocalyptic number.

It is an amenable number.

13820909 is a deficient number, since it is larger than the sum of its proper divisors (99571).

13820909 is an equidigital number, since it uses as much as digits as its factorization.

13820909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99570.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 13820909 is about 3717.6483158040. The cubic root of 13820909 is about 239.9821109351.

The spelling of 13820909 in words is "thirteen million, eight hundred twenty thousand, nine hundred nine".