12921438 has 16 divisors (see below), whose sum is σ = 26197776. Its totient is φ = 4248000.

The previous prime is 12921407. The next prime is 12921449. The reversal of 12921438 is 83412921.

12921438 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

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, 14313 + ... + 15188.

It is an arithmetic number, because the mean of its divisors is an integer number (1637361).

Almost surely, 2^12921438 is an apocalyptic number.

12921438 is an abundant number, since it is smaller than the sum of its proper divisors (13276338).

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

12921438 is a wasteful number, since it uses less digits than its factorization.

12921438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29579.

The product of its digits is 3456, while the sum is 30.

The square root of 12921438 is about 3594.6401767075. The cubic root of 12921438 is about 234.6588561486.

The spelling of 12921438 in words is "twelve million, nine hundred twenty-one thousand, four hundred thirty-eight".