13906209 has 4 divisors (see below), whose sum is σ = 18541616. Its totient is φ = 9270804.

The previous prime is 13906183. The next prime is 13906261. The reversal of 13906209 is 90260931.

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 not a de Polignac number, because 13906209 - 2⁸ = 13905953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13906909) 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, 2317699 + ... + 2317704.

It is an arithmetic number, because the mean of its divisors is an integer number (4635404).

Almost surely, 2^13906209 is an apocalyptic number.

It is an amenable number.

13906209 is a deficient number, since it is larger than the sum of its proper divisors (4635407).

13906209 is an equidigital number, since it uses as much as digits as its factorization.

13906209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4635406.

The product of its (nonzero) digits is 2916, while the sum is 30.

The square root of 13906209 is about 3729.1029752475. The cubic root of 13906209 is about 240.4748065697.

The spelling of 13906209 in words is "thirteen million, nine hundred six thousand, two hundred nine".