12991132 has 24 divisors (see below), whose sum is σ = 28344960. Its totient is φ = 5061360.

The previous prime is 12991127. The next prime is 12991141. The reversal of 12991132 is 23119921.

12991132 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 12991132.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20782 + ... + 21397.

It is an arithmetic number, because the mean of its divisors is an integer number (1181040).

Almost surely, 2^12991132 is an apocalyptic number.

It is an amenable number.

12991132 is an abundant number, since it is smaller than the sum of its proper divisors (15353828).

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

12991132 is a wasteful number, since it uses less digits than its factorization.

12991132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42201 (or 42199 counting only the distinct ones).

The product of its digits is 972, while the sum is 28.

The square root of 12991132 is about 3604.3212953343. The cubic root of 12991132 is about 235.0799908768.

The spelling of 12991132 in words is "twelve million, nine hundred ninety-one thousand, one hundred thirty-two".