12143240 has 16 divisors (see below), whose sum is σ = 27322380. Its totient is φ = 4857280.

The previous prime is 12143237. The next prime is 12143251. The reversal of 12143240 is 4234121.

It can be written as a sum of positive squares in 2 ways, for example, as 11874916 + 268324 = 3446^2 + 518^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151751 + ... + 151830.

Almost surely, 2^12143240 is an apocalyptic number.

12143240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12143240 is an abundant number, since it is smaller than the sum of its proper divisors (15179140).

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

12143240 is a wasteful number, since it uses less digits than its factorization.

12143240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303592 (or 303588 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 12143240 is about 3484.7151963970. The cubic root of 12143240 is about 229.8501859914.

Adding to 12143240 its reverse (4234121), we get a palindrome (16377361).

The spelling of 12143240 in words is "twelve million, one hundred forty-three thousand, two hundred forty".