12921888 has 144 divisors (see below), whose sum is σ = 41023584. Its totient is φ = 3548160.

The previous prime is 12921863. The next prime is 12921893. The reversal of 12921888 is 88812921.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 192831 + ... + 192897.

It is an arithmetic number, because the mean of its divisors is an integer number (284886).

Almost surely, 2^12921888 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 12921888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20511792).

12921888 is an abundant number, since it is smaller than the sum of its proper divisors (28101696).

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

12921888 is a wasteful number, since it uses less digits than its factorization.

12921888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135 (or 120 counting only the distinct ones).

The product of its digits is 18432, while the sum is 39.

The square root of 12921888 is about 3594.7027693538. The cubic root of 12921888 is about 234.6615801813.

The spelling of 12921888 in words is "twelve million, nine hundred twenty-one thousand, eight hundred eighty-eight".