12005505 has 24 divisors (see below), whose sum is σ = 20891520. Its totient is φ = 6377760.

The previous prime is 12005489. The next prime is 12005509. The reversal of 12005505 is 50550021.

It is not a de Polignac number, because 12005505 - 2⁴ = 12005489 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12005509) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19086 + ... + 19704.

It is an arithmetic number, because the mean of its divisors is an integer number (870480).

Almost surely, 2^12005505 is an apocalyptic number.

12005505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12005505 is a deficient number, since it is larger than the sum of its proper divisors (8886015).

12005505 is a wasteful number, since it uses less digits than its factorization.

12005505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1061 (or 1058 counting only the distinct ones).

The product of its (nonzero) digits is 250, while the sum is 18.

The square root of 12005505 is about 3464.8961023384. The cubic root of 12005505 is about 228.9778523358.

Adding to 12005505 its reverse (50550021), we get a palindrome (62555526).

The spelling of 12005505 in words is "twelve million, five thousand, five hundred five".