12005655 has 48 divisors (see below), whose sum is σ = 21500640. Its totient is φ = 5699584.

The previous prime is 12005641. The next prime is 12005659. The reversal of 12005655 is 55650021.

It is not a de Polignac number, because 12005655 - 2⁷ = 12005527 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12005659) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 134851 + ... + 134939.

It is an arithmetic number, because the mean of its divisors is an integer number (447930).

Almost surely, 2^12005655 is an apocalyptic number.

12005655 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12005655 is a deficient number, since it is larger than the sum of its proper divisors (9494985).

12005655 is a wasteful number, since it uses less digits than its factorization.

12005655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160 (or 137 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 24.

The square root of 12005655 is about 3464.9177479415. The cubic root of 12005655 is about 228.9788059687.

Adding to 12005655 its reverse (55650021), we get a palindrome (67655676).

The spelling of 12005655 in words is "twelve million, five thousand, six hundred fifty-five".