12143400 has 96 divisors (see below), whose sum is σ = 38732640. Its totient is φ = 3144960.

The previous prime is 12143387. The next prime is 12143407. The reversal of 12143400 is 434121.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 12143400.

It is not an unprimeable number, because it can be changed into a prime (12143407) by changing a digit.

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, 21927 + ... + 22473.

It is an arithmetic number, because the mean of its divisors is an integer number (403465).

Almost surely, 2^12143400 is an apocalyptic number.

12143400 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 12143400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19366320).

12143400 is an abundant number, since it is smaller than the sum of its proper divisors (26589240).

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

12143400 is a wasteful number, since it uses less digits than its factorization.

12143400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 603 (or 594 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 12143400 is about 3484.7381537212. The cubic root of 12143400 is about 229.8511954932.

Adding to 12143400 its reverse (434121), we get a palindrome (12577521).

The spelling of 12143400 in words is "twelve million, one hundred forty-three thousand, four hundred".