12291144 has 32 divisors (see below), whose sum is σ = 31479840. Its totient is φ = 3996800.

The previous prime is 12291121. The next prime is 12291179. The reversal of 12291144 is 44119221.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5262 + ... + 7229.

It is an arithmetic number, because the mean of its divisors is an integer number (983745).

Almost surely, 2^12291144 is an apocalyptic number.

It is an amenable number.

12291144 is an abundant number, since it is smaller than the sum of its proper divisors (19188696).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12291144 is a wasteful number, since it uses less digits than its factorization.

12291144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12541 (or 12537 counting only the distinct ones).

The product of its digits is 576, while the sum is 24.

The square root of 12291144 is about 3505.8727871958. The cubic root of 12291144 is about 230.7796102682.

The spelling of 12291144 in words is "twelve million, two hundred ninety-one thousand, one hundred forty-four".