12171409 has 8 divisors (see below), whose sum is σ = 12628008. Its totient is φ = 11721600.

The previous prime is 12171389. The next prime is 12171413. The reversal of 12171409 is 90417121.

12171409 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 9784384 + 2387025 = 3128^2 + 1545^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12171409 - 2¹¹ = 12169361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12171469) 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, 2109 + ... + 5365.

It is an arithmetic number, because the mean of its divisors is an integer number (1578501).

Almost surely, 2^12171409 is an apocalyptic number.

It is an amenable number.

12171409 is a deficient number, since it is larger than the sum of its proper divisors (456599).

12171409 is a wasteful number, since it uses less digits than its factorization.

12171409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3395.

The product of its (nonzero) digits is 504, while the sum is 25.

The square root of 12171409 is about 3488.7546488683. The cubic root of 12171409 is about 230.0277786234.

The spelling of 12171409 in words is "twelve million, one hundred seventy-one thousand, four hundred nine".