12143940 has 48 divisors (see below), whose sum is σ = 35105280. Its totient is φ = 3133440.

The previous prime is 12143939. The next prime is 12143969. The reversal of 12143940 is 4934121.

It is a self number, because there is not a number n which added to its sum of digits gives 12143940.

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 15 ways as a sum of consecutive naturals, for example, 1405 + ... + 5124.

It is an arithmetic number, because the mean of its divisors is an integer number (731360).

Almost surely, 2^12143940 is an apocalyptic number.

12143940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12143940 is an abundant number, since it is smaller than the sum of its proper divisors (22961340).

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

12143940 is a wasteful number, since it uses less digits than its factorization.

12143940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6572 (or 6570 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 12143940 is about 3484.8156335737. The cubic root of 12143940 is about 229.8546024964.

The spelling of 12143940 in words is "twelve million, one hundred forty-three thousand, nine hundred forty".