12439818 has 40 divisors (see below), whose sum is σ = 29520612. Its totient is φ = 3901824.

The previous prime is 12439783. The next prime is 12439829. The reversal of 12439818 is 81893421.

12439818 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 11881809 + 558009 = 3447^2 + 747^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 496 + ... + 5012.

Almost surely, 2^12439818 is an apocalyptic number.

12439818 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 12439818, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14760306).

12439818 is an abundant number, since it is smaller than the sum of its proper divisors (17080794).

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

12439818 is a wasteful number, since it uses less digits than its factorization.

12439818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4548 (or 4539 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 12439818 is about 3527.0126169324. The cubic root of 12439818 is about 231.7063888779.

The spelling of 12439818 in words is "twelve million, four hundred thirty-nine thousand, eight hundred eighteen".