12278438926 has 16 divisors (see below), whose sum is σ = 19851245568. Its totient is φ = 5662159200.

The previous prime is 12278438891. The next prime is 12278438929. The reversal of 12278438926 is 62983487221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12278438929) 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, 169230 + ... + 230641.

It is an arithmetic number, because the mean of its divisors is an integer number (1240702848).

Almost surely, 2^12278438926 is an apocalyptic number.

12278438926 is a deficient number, since it is larger than the sum of its proper divisors (7572806642).

12278438926 is a wasteful number, since it uses less digits than its factorization.

12278438926 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401067.

The product of its digits is 2322432, while the sum is 52.

The spelling of 12278438926 in words is "twelve billion, two hundred seventy-eight million, four hundred thirty-eight thousand, nine hundred twenty-six".