12991104 has 160 divisors (see below), whose sum is σ = 44431200. Its totient is φ = 3691008.

The previous prime is 12991103. The next prime is 12991127. The reversal of 12991104 is 40119921.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (12991103) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 72487 + ... + 72665.

It is an arithmetic number, because the mean of its divisors is an integer number (277695).

Almost surely, 2^12991104 is an apocalyptic number.

12991104 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12991104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22215600).

12991104 is an abundant number, since it is smaller than the sum of its proper divisors (31440096).

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

12991104 is an equidigital number, since it uses as much as digits as its factorization.

12991104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212 (or 191 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The square root of 12991104 is about 3604.3174111057. The cubic root of 12991104 is about 235.0798219861.

The spelling of 12991104 in words is "twelve million, nine hundred ninety-one thousand, one hundred four".