12208997988 has 144 divisors (see below), whose sum is σ = 34315636992. Its totient is φ = 3628800000.

The previous prime is 12208997981. The next prime is 12208998013. The reversal of 12208997988 is 88979980221.

It is not an unprimeable number, because it can be changed into a prime (12208997981) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 16256613 + ... + 16257363.

Almost surely, 2^12208997988 is an apocalyptic number.

12208997988 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12208997988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17157818496).

12208997988 is an abundant number, since it is smaller than the sum of its proper divisors (22106639004).

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

12208997988 is a wasteful number, since it uses less digits than its factorization.

12208997988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1506 (or 1501 counting only the distinct ones).

The product of its (nonzero) digits is 10450944, while the sum is 63.

The spelling of 12208997988 in words is "twelve billion, two hundred eight million, nine hundred ninety-seven thousand, nine hundred eighty-eight".