12143780 has 72 divisors (see below), whose sum is σ = 29707776. Its totient is φ = 4134400.

The previous prime is 12143777. The next prime is 12143809. The reversal of 12143780 is 8734121.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 63485 + ... + 63675.

It is an arithmetic number, because the mean of its divisors is an integer number (412608).

Almost surely, 2^12143780 is an apocalyptic number.

12143780 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 12143780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14853888).

12143780 is an abundant number, since it is smaller than the sum of its proper divisors (17563996).

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

12143780 is a wasteful number, since it uses less digits than its factorization.

12143780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245 (or 226 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 12143780 is about 3484.7926767600. The cubic root of 12143780 is about 229.8535930245.

It can be divided in two parts, 1214 and 3780, that added together give a palindrome (4994).

The spelling of 12143780 in words is "twelve million, one hundred forty-three thousand, seven hundred eighty".