12438939 has 8 divisors (see below), whose sum is σ = 17458240. Its totient is φ = 7856136.

The previous prime is 12438931. The next prime is 12438947. The reversal of 12438939 is 93983421.

12438939 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (12438931) and next prime (12438947).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12438939 - 2³ = 12438931 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12438897 and 12438906.

It is not an unprimeable number, because it can be changed into a prime (12438931) 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, 109057 + ... + 109170.

It is an arithmetic number, because the mean of its divisors is an integer number (2182280).

Almost surely, 2^12438939 is an apocalyptic number.

12438939 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

12438939 is a deficient number, since it is larger than the sum of its proper divisors (5019301).

12438939 is a wasteful number, since it uses less digits than its factorization.

12438939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218249.

The product of its digits is 46656, while the sum is 39.

The square root of 12438939 is about 3526.8880050265. Note that the first 3 decimals coincide. The cubic root of 12438939 is about 231.7009312763.

The spelling of 12438939 in words is "twelve million, four hundred thirty-eight thousand, nine hundred thirty-nine".