13745909 has 4 divisors (see below), whose sum is σ = 13766220. Its totient is φ = 13725600.

The previous prime is 13745903. The next prime is 13745929. The reversal of 13745909 is 90954731.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13140625 + 605284 = 3625^2 + 778^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13745909 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13745903) 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, 9104 + ... + 10505.

It is an arithmetic number, because the mean of its divisors is an integer number (3441555).

Almost surely, 2^13745909 is an apocalyptic number.

It is an amenable number.

13745909 is a deficient number, since it is larger than the sum of its proper divisors (20311).

13745909 is an equidigital number, since it uses as much as digits as its factorization.

13745909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20310.

The product of its (nonzero) digits is 34020, while the sum is 38.

The square root of 13745909 is about 3707.5475721830. The cubic root of 13745909 is about 239.5472308617.

The spelling of 13745909 in words is "thirteen million, seven hundred forty-five thousand, nine hundred nine".