12171612 has 12 divisors (see below), whose sum is σ = 28400456. Its totient is φ = 4057200.

The previous prime is 12171589. The next prime is 12171617. The reversal of 12171612 is 21617121.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12171617) 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, 507139 + ... + 507162.

Almost surely, 2^12171612 is an apocalyptic number.

12171612 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12171612 is an abundant number, since it is smaller than the sum of its proper divisors (16228844).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12171612 is a wasteful number, since it uses less digits than its factorization.

12171612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1014308 (or 1014306 counting only the distinct ones).

The product of its digits is 168, while the sum is 21.

The square root of 12171612 is about 3488.7837422231. The cubic root of 12171612 is about 230.0290574504.

Adding to 12171612 its reverse (21617121), we get a palindrome (33788733).

The spelling of 12171612 in words is "twelve million, one hundred seventy-one thousand, six hundred twelve".