12138044780 has 24 divisors (see below), whose sum is σ = 25491973920. Its totient is φ = 4854821760.

The previous prime is 12138044777. The next prime is 12138044783. The reversal of 12138044780 is 8744083121.

It is an interprime number because it is at equal distance from previous prime (12138044777) and next prime (12138044783).

It is not an unprimeable number, because it can be changed into a prime (12138044783) 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, 431960 + ... + 459200.

It is an arithmetic number, because the mean of its divisors is an integer number (1062165580).

Almost surely, 2^12138044780 is an apocalyptic number.

12138044780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12138044780 is an abundant number, since it is smaller than the sum of its proper divisors (13353929140).

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

12138044780 is a wasteful number, since it uses less digits than its factorization.

12138044780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49529 (or 49527 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 38.

The spelling of 12138044780 in words is "twelve billion, one hundred thirty-eight million, forty-four thousand, seven hundred eighty".