12909 has 8 divisors (see below), whose sum is σ = 18592. Its totient is φ = 7920.
The previous prime is 12907. The next prime is 12911. The reversal of 12909 is 90921.
12909 = T49 + T50 + ... + T57.
It is a happy number.
12909 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.
It is an interprime number because it is at equal distance from previous prime (12907) and next prime (12911).
It is a sphenic number, since it is the product of 3 distinct primes.
It is not a de Polignac number, because 12909 - 21 = 12907 is a prime.
It is an alternating number because its digits alternate between odd and even.
It is a Duffinian number.
It is a Curzon number.
It is a nialpdrome in base 11.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (12907) by changing a digit.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 127 + ... + 204.
It is an arithmetic number, because the mean of its divisors is an integer number (2324).
212909 is an apocalyptic number.
It is an amenable number.
12909 is a deficient number, since it is larger than the sum of its proper divisors (5683).
12909 is a wasteful number, since it uses less digits than its factorization.
12909 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 347.
The product of its (nonzero) digits is 162, while the sum is 21.
The square root of 12909 is about 113.6177802987. The cubic root of 12909 is about 23.4583538839.
The spelling of 12909 in words is "twelve thousand, nine hundred nine".
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