12171864 has 32 divisors (see below), whose sum is σ = 32220720. Its totient is φ = 3818496.

The previous prime is 12171833. The next prime is 12171889. The reversal of 12171864 is 46817121.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14509 + ... + 15324.

Almost surely, 2^12171864 is an apocalyptic number.

It is an amenable number.

12171864 is an abundant number, since it is smaller than the sum of its proper divisors (20048856).

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

12171864 is a wasteful number, since it uses less digits than its factorization.

12171864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29859 (or 29855 counting only the distinct ones).

The product of its digits is 2688, while the sum is 30.

The square root of 12171864 is about 3488.8198577743. The cubic root of 12171864 is about 230.0306449400.

Adding to 12171864 its reverse (46817121), we get a palindrome (58988985).

It can be divided in two parts, 1217 and 1864, that added together give a triangular number (3081 = T₇₈).

The spelling of 12171864 in words is "twelve million, one hundred seventy-one thousand, eight hundred sixty-four".