12891445 has 8 divisors (see below), whose sum is σ = 17679744. Its totient is φ = 8839824.

The previous prime is 12891433. The next prime is 12891449. The reversal of 12891445 is 54419821.

It is a happy number.

12891445 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a de Polignac number, because none of the positive numbers 2^k-12891445 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12891445.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12891449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 184129 + ... + 184198.

It is an arithmetic number, because the mean of its divisors is an integer number (2209968).

Almost surely, 2^12891445 is an apocalyptic number.

It is an amenable number.

12891445 is a deficient number, since it is larger than the sum of its proper divisors (4788299).

12891445 is an equidigital number, since it uses as much as digits as its factorization.

12891445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368339.

The product of its digits is 11520, while the sum is 34.

The square root of 12891445 is about 3590.4658472126. The cubic root of 12891445 is about 234.4771535731.

The spelling of 12891445 in words is "twelve million, eight hundred ninety-one thousand, four hundred forty-five".