12171984 has 40 divisors (see below), whose sum is σ = 34304352. Its totient is φ = 3688320.

The previous prime is 12171979. The next prime is 12171997. The reversal of 12171984 is 48917121.

It is a Harshad number since it is a multiple of its sum of digits (33).

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, 10999 + ... + 12054.

Almost surely, 2^12171984 is an apocalyptic number.

It is an amenable number.

12171984 is an abundant number, since it is smaller than the sum of its proper divisors (22132368).

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

12171984 is a wasteful number, since it uses less digits than its factorization.

12171984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23075 (or 23069 counting only the distinct ones).

The product of its digits is 4032, while the sum is 33.

The square root of 12171984 is about 3488.8370555244. The cubic root of 12171984 is about 230.0314008798.

The spelling of 12171984 in words is "twelve million, one hundred seventy-one thousand, nine hundred eighty-four".