12990155 has 8 divisors (see below), whose sum is σ = 15643152. Its totient is φ = 10355488.

The previous prime is 12990151. The next prime is 12990157. The reversal of 12990155 is 55109921.

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 12990155 - 2² = 12990151 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12990151) 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, 2969 + ... + 5898.

It is an arithmetic number, because the mean of its divisors is an integer number (1955394).

Almost surely, 2^12990155 is an apocalyptic number.

12990155 is a deficient number, since it is larger than the sum of its proper divisors (2652997).

12990155 is an equidigital number, since it uses as much as digits as its factorization.

12990155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9165.

The product of its (nonzero) digits is 4050, while the sum is 32.

The square root of 12990155 is about 3604.1857610284. The cubic root of 12990155 is about 235.0740976539.

The spelling of 12990155 in words is "twelve million, nine hundred ninety thousand, one hundred fifty-five".