12005649 has 24 divisors (see below), whose sum is σ = 18400512. Its totient is φ = 7529760.

The previous prime is 12005641. The next prime is 12005659. The reversal of 12005649 is 94650021.

12005649 is a `hidden beast` number, since 12 + 0 + 0 + 5 + 649 = 666.

It is not a de Polignac number, because 12005649 - 2³ = 12005641 is a prime.

It is a super-2 number, since 2×12005649² = 288271215822402, which contains 22 as substring.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (12005641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9742 + ... + 10904.

It is an arithmetic number, because the mean of its divisors is an integer number (766688).

Almost surely, 2^12005649 is an apocalyptic number.

It is an amenable number.

12005649 is a deficient number, since it is larger than the sum of its proper divisors (6394863).

12005649 is a wasteful number, since it uses less digits than its factorization.

12005649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1237 (or 1234 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 12005649 is about 3464.9168821200. The cubic root of 12005649 is about 228.9787678236.

The spelling of 12005649 in words is "twelve million, five thousand, six hundred forty-nine".