12000991860 has 192 divisors, whose sum is σ = 43864047360. Its totient is φ = 2685519360.

The previous prime is 12000991853. The next prime is 12000991867. The reversal of 12000991860 is 6819900021.

It is an interprime number because it is at equal distance from previous prime (12000991853) and next prime (12000991867).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12000991867) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 487 + ... + 154926.

It is an arithmetic number, because the mean of its divisors is an integer number (228458580).

Almost surely, 2^12000991860 is an apocalyptic number.

12000991860 is a gapful number since it is divisible by the number (10) 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 12000991860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21932023680).

12000991860 is an abundant number, since it is smaller than the sum of its proper divisors (31863055500).

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

12000991860 is a wasteful number, since it uses less digits than its factorization.

12000991860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155455 (or 155447 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 36.

The spelling of 12000991860 in words is "twelve billion, nine hundred ninety-one thousand, eight hundred sixty".