12143550 has 48 divisors (see below), whose sum is σ = 30556080. Its totient is φ = 3191040.

The previous prime is 12143513. The next prime is 12143561. The reversal of 12143550 is 5534121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10396 + ... + 11504.

It is an arithmetic number, because the mean of its divisors is an integer number (636585).

Almost surely, 2^12143550 is an apocalyptic number.

12143550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 12143550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15278040).

12143550 is an abundant number, since it is smaller than the sum of its proper divisors (18412530).

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

12143550 is a wasteful number, since it uses less digits than its factorization.

12143550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1197 (or 1192 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 12143550 is about 3484.7596760752. The cubic root of 12143550 is about 229.8521418931.

Adding to 12143550 its reverse (5534121), we get a palindrome (17677671).

The spelling of 12143550 in words is "twelve million, one hundred forty-three thousand, five hundred fifty".