12115478388 has 24 divisors (see below), whose sum is σ = 30444023008. Its totient is φ = 3727839456.

The previous prime is 12115478387. The next prime is 12115478429. The reversal of 12115478388 is 88387451121.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12115478381) 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, 38831506 + ... + 38831817.

Almost surely, 2^12115478388 is an apocalyptic number.

It is an amenable number.

12115478388 is an abundant number, since it is smaller than the sum of its proper divisors (18328544620).

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

12115478388 is a wasteful number, since it uses less digits than its factorization.

12115478388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77663343 (or 77663341 counting only the distinct ones).

The product of its digits is 430080, while the sum is 48.

The spelling of 12115478388 in words is "twelve billion, one hundred fifteen million, four hundred seventy-eight thousand, three hundred eighty-eight".