12171772 has 6 divisors (see below), whose sum is σ = 21300608. Its totient is φ = 6085884.

The previous prime is 12171763. The next prime is 12171773. The reversal of 12171772 is 27717121.

It is a self number, because there is not a number n which added to its sum of digits gives 12171772.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12171773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1521468 + ... + 1521475.

Almost surely, 2^12171772 is an apocalyptic number.

It is an amenable number.

12171772 is a deficient number, since it is larger than the sum of its proper divisors (9128836).

12171772 is a wasteful number, since it uses less digits than its factorization.

12171772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3042947 (or 3042945 counting only the distinct ones).

The product of its digits is 1372, while the sum is 28.

The square root of 12171772 is about 3488.8066727751. The cubic root of 12171772 is about 230.0300653829.

Adding to 12171772 its reverse (27717121), we get a palindrome (39888893).

The spelling of 12171772 in words is "twelve million, one hundred seventy-one thousand, seven hundred seventy-two".