13799209 has 2 divisors, whose sum is σ = 13799210. Its totient is φ = 13799208.

The previous prime is 13799207. The next prime is 13799249. The reversal of 13799209 is 90299731.

13799209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (13799249) can be obtained adding 13799209 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12425625 + 1373584 = 3525^2 + 1172^2 .

It is a cyclic number.

It is not a de Polignac number, because 13799209 - 2¹ = 13799207 is a prime.

Together with 13799207, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (13799207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6899604 + 6899605.

It is an arithmetic number, because the mean of its divisors is an integer number (6899605).

Almost surely, 2^13799209 is an apocalyptic number.

It is an amenable number.

13799209 is a deficient number, since it is larger than the sum of its proper divisors (1).

13799209 is an equidigital number, since it uses as much as digits as its factorization.

13799209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30618, while the sum is 40.

The square root of 13799209 is about 3714.7286576546. The cubic root of 13799209 is about 239.8564477184.

The spelling of 13799209 in words is "thirteen million, seven hundred ninety-nine thousand, two hundred nine".