12920144 has 10 divisors (see below), whose sum is σ = 25032810. Its totient is φ = 6460064.

The previous prime is 12920093. The next prime is 12920177. The reversal of 12920144 is 44102921.

It can be written as a sum of positive squares in only one way, i.e., 8340544 + 4579600 = 2888^2 + 2140^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 403739 + ... + 403770.

It is an arithmetic number, because the mean of its divisors is an integer number (2503281).

Almost surely, 2^12920144 is an apocalyptic number.

It is an amenable number.

12920144 is a deficient number, since it is larger than the sum of its proper divisors (12112666).

12920144 is an equidigital number, since it uses as much as digits as its factorization.

12920144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 807517 (or 807511 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 12920144 is about 3594.4601820023. The cubic root of 12920144 is about 234.6510226888.

The spelling of 12920144 in words is "twelve million, nine hundred twenty thousand, one hundred forty-four".