12989478438 has 16 divisors (see below), whose sum is σ = 28865507760. Its totient is φ = 4329826128.

The previous prime is 12989478433. The next prime is 12989478449. The reversal of 12989478438 is 83487498921.

12989478438 is a `hidden beast` number, since 129 + 8 + 9 + 4 + 78 + 438 = 666.

12989478438 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12989478433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 120272895 + ... + 120273002.

It is an arithmetic number, because the mean of its divisors is an integer number (1804094235).

Almost surely, 2^12989478438 is an apocalyptic number.

12989478438 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

12989478438 is an abundant number, since it is smaller than the sum of its proper divisors (15876029322).

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

12989478438 is a wasteful number, since it uses less digits than its factorization.

12989478438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240545908 (or 240545902 counting only the distinct ones).

The product of its digits is 27869184, while the sum is 63.

The spelling of 12989478438 in words is "twelve billion, nine hundred eighty-nine million, four hundred seventy-eight thousand, four hundred thirty-eight".