12172085 has 16 divisors (see below), whose sum is σ = 15649200. Its totient is φ = 9056256.

The previous prime is 12172081. The next prime is 12172087. The reversal of 12172085 is 58027121.

It can be written as a sum of positive squares in 8 ways, for example, as 625681 + 11546404 = 791^2 + 3398^2 .

It is a cyclic number.

It is not a de Polignac number, because 12172085 - 2² = 12172081 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12172081) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6761 + ... + 8369.

It is an arithmetic number, because the mean of its divisors is an integer number (978075).

Almost surely, 2^12172085 is an apocalyptic number.

It is an amenable number.

12172085 is a deficient number, since it is larger than the sum of its proper divisors (3477115).

12172085 is a wasteful number, since it uses less digits than its factorization.

12172085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1720.

The product of its (nonzero) digits is 1120, while the sum is 26.

The square root of 12172085 is about 3488.8515302317. The cubic root of 12172085 is about 230.0320371252.

The spelling of 12172085 in words is "twelve million, one hundred seventy-two thousand, eighty-five".