12205155 has 8 divisors (see below), whose sum is σ = 19528272. Its totient is φ = 6509408.

The previous prime is 12205121. The next prime is 12205159. The reversal of 12205155 is 55150221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12205155 - 2¹⁵ = 12172387 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12205159) 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 7 ways as a sum of consecutive naturals, for example, 406824 + ... + 406853.

It is an arithmetic number, because the mean of its divisors is an integer number (2441034).

Almost surely, 2^12205155 is an apocalyptic number.

12205155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12205155 is a deficient number, since it is larger than the sum of its proper divisors (7323117).

12205155 is an equidigital number, since it uses as much as digits as its factorization.

12205155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 813685.

The product of its (nonzero) digits is 500, while the sum is 21.

The square root of 12205155 is about 3493.5876974823. The cubic root of 12205155 is about 230.2401713005.

Adding to 12205155 its reverse (55150221), we get a palindrome (67355376).

The spelling of 12205155 in words is "twelve million, two hundred five thousand, one hundred fifty-five".