12991884 has 48 divisors (see below), whose sum is σ = 32239200. Its totient is φ = 4064256.

The previous prime is 12991879. The next prime is 12991931. The reversal of 12991884 is 48819921.

12991884 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12372 + ... + 13380.

It is an arithmetic number, because the mean of its divisors is an integer number (671650).

Almost surely, 2^12991884 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12991884, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16119600).

12991884 is an abundant number, since it is smaller than the sum of its proper divisors (19247316).

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

12991884 is a wasteful number, since it uses less digits than its factorization.

12991884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1082 (or 1080 counting only the distinct ones).

The product of its digits is 41472, while the sum is 42.

The square root of 12991884 is about 3604.4256130485. The cubic root of 12991884 is about 235.0845267079.

The spelling of 12991884 in words is "twelve million, nine hundred ninety-one thousand, eight hundred eighty-four".