12172705 has 8 divisors (see below), whose sum is σ = 14641704. Its totient is φ = 9715200.

The previous prime is 12172691. The next prime is 12172709. The reversal of 12172705 is 50727121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6561 + 12166144 = 81^2 + 3488^2 .

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

It is not a de Polignac number, because 12172705 - 2¹³ = 12164513 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12172705.

It is not an unprimeable number, because it can be changed into a prime (12172709) 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, 336 + ... + 4945.

It is an arithmetic number, because the mean of its divisors is an integer number (1830213).

Almost surely, 2^12172705 is an apocalyptic number.

It is an amenable number.

12172705 is a deficient number, since it is larger than the sum of its proper divisors (2468999).

12172705 is an equidigital number, since it uses as much as digits as its factorization.

12172705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5747.

The product of its (nonzero) digits is 980, while the sum is 25.

The square root of 12172705 is about 3488.9403835549. The cubic root of 12172705 is about 230.0359427130.

Adding to 12172705 its reverse (50727121), we get a palindrome (62899826).

The spelling of 12172705 in words is "twelve million, one hundred seventy-two thousand, seven hundred five".