12939218 has 8 divisors (see below), whose sum is σ = 19609212. Its totient is φ = 6402816.

The previous prime is 12939217. The next prime is 12939257. The reversal of 12939218 is 81293921.

It can be written as a sum of positive squares in 2 ways, for example, as 11135569 + 1803649 = 3337^2 + 1343^2 .

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

It is not an unprimeable number, because it can be changed into a prime (12939217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33155 + ... + 33542.

Almost surely, 2^12939218 is an apocalyptic number.

12939218 is a deficient number, since it is larger than the sum of its proper divisors (6669994).

12939218 is an equidigital number, since it uses as much as digits as its factorization.

12939218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66796.

The product of its digits is 7776, while the sum is 35.

The square root of 12939218 is about 3597.1124530657. The cubic root of 12939218 is about 234.7664376280.

The spelling of 12939218 in words is "twelve million, nine hundred thirty-nine thousand, two hundred eighteen".