12143988 has 36 divisors (see below), whose sum is σ = 31124548. Its totient is φ = 3991680.

The previous prime is 12143981. The next prime is 12143993. The reversal of 12143988 is 88934121.

It can be written as a sum of positive squares in 2 ways, for example, as 5702544 + 6441444 = 2388^2 + 2538^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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 (12143981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 318 + ... + 4938.

Almost surely, 2^12143988 is an apocalyptic number.

12143988 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 12143988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15562274).

12143988 is an abundant number, since it is smaller than the sum of its proper divisors (18980560).

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

12143988 is a wasteful number, since it uses less digits than its factorization.

12143988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4704 (or 4699 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 12143988 is about 3484.8225205884. The cubic root of 12143988 is about 229.8549053362.

It can be divided in two parts, 12143 and 988, that added together give a palindrome (13131).

The spelling of 12143988 in words is "twelve million, one hundred forty-three thousand, nine hundred eighty-eight".