13923809 has 6 divisors (see below), whose sum is σ = 14556066. Its totient is φ = 13317920.

The previous prime is 13923779. The next prime is 13923821. The reversal of 13923809 is 90832931.

It can be written as a sum of positive squares in only one way, i.e., 13712209 + 211600 = 3703^2 + 460^2 .

It is a de Polignac number, because none of the positive numbers 2^k-13923809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13923109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12632 + ... + 13689.

It is an arithmetic number, because the mean of its divisors is an integer number (2426011).

Almost surely, 2^13923809 is an apocalyptic number.

It is an amenable number.

13923809 is a deficient number, since it is larger than the sum of its proper divisors (632257).

13923809 is an equidigital number, since it uses as much as digits as its factorization.

13923809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26367 (or 26344 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 13923809 is about 3731.4620459010. The cubic root of 13923809 is about 240.5762138458.

The spelling of 13923809 in words is "thirteen million, nine hundred twenty-three thousand, eight hundred nine".