12127155 has 32 divisors (see below), whose sum is σ = 20113920. Its totient is φ = 6236160.

The previous prime is 12127139. The next prime is 12127177. The reversal of 12127155 is 55172121.

It is not a de Polignac number, because 12127155 - 2⁴ = 12127139 is a prime.

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 31 ways as a sum of consecutive naturals, for example, 62739 + ... + 62931.

It is an arithmetic number, because the mean of its divisors is an integer number (628560).

Almost surely, 2^12127155 is an apocalyptic number.

12127155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12127155 is a deficient number, since it is larger than the sum of its proper divisors (7986765).

12127155 is a wasteful number, since it uses less digits than its factorization.

12127155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331.

The product of its digits is 700, while the sum is 24.

The square root of 12127155 is about 3482.4064955143. The cubic root of 12127155 is about 229.7486542239.

Adding to 12127155 its reverse (55172121), we get a palindrome (67299276).

The spelling of 12127155 in words is "twelve million, one hundred twenty-seven thousand, one hundred fifty-five".