12449921 has 16 divisors (see below), whose sum is σ = 14515200. Its totient is φ = 10558800.

The previous prime is 12449909. The next prime is 12449939. The reversal of 12449921 is 12994421.

It is a cyclic number.

It is not a de Polignac number, because 12449921 - 2¹⁰ = 12448897 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12449951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14420 + ... + 15258.

It is an arithmetic number, because the mean of its divisors is an integer number (907200).

Almost surely, 2^12449921 is an apocalyptic number.

12449921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12449921 is a deficient number, since it is larger than the sum of its proper divisors (2065279).

12449921 is a wasteful number, since it uses less digits than its factorization.

12449921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 940.

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

The square root of 12449921 is about 3528.4445581587. Note that the first 3 decimals coincide. The cubic root of 12449921 is about 231.7690986969.

The spelling of 12449921 in words is "twelve million, four hundred forty-nine thousand, nine hundred twenty-one".