12173091840 has 528 divisors, whose sum is σ = 51931047168. Its totient is φ = 2567503872.

The previous prime is 12173091829. The next prime is 12173091841. The reversal of 12173091840 is 4819037121.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 12173091795 and 12173091804.

It is not an unprimeable number, because it can be changed into a prime (12173091841) 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, 4191829 + ... + 4194731.

It is an arithmetic number, because the mean of its divisors is an integer number (98354256).

Almost surely, 2^12173091840 is an apocalyptic number.

12173091840 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 12173091840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25965523584).

12173091840 is an abundant number, since it is smaller than the sum of its proper divisors (39757955328).

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

12173091840 is a wasteful number, since it uses less digits than its factorization.

12173091840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2954 (or 2933 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The spelling of 12173091840 in words is "twelve billion, one hundred seventy-three million, ninety-one thousand, eight hundred forty".