1243612140 has 48 divisors (see below), whose sum is σ = 3547823328. Its totient is φ = 325371904.

The previous prime is 1243612129. The next prime is 1243612147. The reversal of 1243612140 is 412163421.

It is a self number, because there is not a number n which added to its sum of digits gives 1243612140.

It is not an unprimeable number, because it can be changed into a prime (1243612147) 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 15 ways as a sum of consecutive naturals, for example, 192357 + ... + 198716.

It is an arithmetic number, because the mean of its divisors is an integer number (73912986).

Almost surely, 2^1243612140 is an apocalyptic number.

1243612140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1243612140 is an abundant number, since it is smaller than the sum of its proper divisors (2304211188).

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

1243612140 is a wasteful number, since it uses less digits than its factorization.

1243612140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391138 (or 391136 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 1243612140 is about 35264.8853677422. The cubic root of 1243612140 is about 1075.3792467568.

Adding to 1243612140 its reverse (412163421), we get a palindrome (1655775561).

The spelling of 1243612140 in words is "one billion, two hundred forty-three million, six hundred twelve thousand, one hundred forty".