12921944 has 32 divisors (see below), whose sum is σ = 28166400. Its totient is φ = 5442720.

The previous prime is 12921943. The next prime is 12921967. The reversal of 12921944 is 44912921.

It is a self number, because there is not a number n which added to its sum of digits gives 12921944.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12921941) 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, 1349 + ... + 5259.

It is an arithmetic number, because the mean of its divisors is an integer number (880200).

Almost surely, 2^12921944 is an apocalyptic number.

12921944 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 12921944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14083200).

12921944 is an abundant number, since it is smaller than the sum of its proper divisors (15244456).

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

12921944 is a wasteful number, since it uses less digits than its factorization.

12921944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3983 (or 3979 counting only the distinct ones).

The product of its digits is 5184, while the sum is 32.

The square root of 12921944 is about 3594.7105585847. The cubic root of 12921944 is about 234.6619191676.

The spelling of 12921944 in words is "twelve million, nine hundred twenty-one thousand, nine hundred forty-four".