12439778 has 8 divisors (see below), whose sum is σ = 20095068. Its totient is φ = 5741424.

The previous prime is 12439751. The next prime is 12439783. The reversal of 12439778 is 87793421.

It can be written as a sum of positive squares in 2 ways, for example, as 12439729 + 49 = 3527^2 + 7^2 .

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

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 239201 + ... + 239252.

Almost surely, 2^12439778 is an apocalyptic number.

12439778 is a deficient number, since it is larger than the sum of its proper divisors (7655290).

12439778 is a wasteful number, since it uses less digits than its factorization.

12439778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 478468.

The product of its digits is 84672, while the sum is 41.

The square root of 12439778 is about 3527.0069464065. The cubic root of 12439778 is about 231.7061405285.

The spelling of 12439778 in words is "twelve million, four hundred thirty-nine thousand, seven hundred seventy-eight".