1243013240 has 64 divisors (see below), whose sum is σ = 3256666560. Its totient is φ = 418129920.

The previous prime is 1243013227. The next prime is 1243013251. The reversal of 1243013240 is 423103421.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27041 + ... + 56720.

It is an arithmetic number, because the mean of its divisors is an integer number (50885415).

Almost surely, 2^1243013240 is an apocalyptic number.

1243013240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1243013240 is an abundant number, since it is smaller than the sum of its proper divisors (2013653320).

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

1243013240 is a wasteful number, since it uses less digits than its factorization.

1243013240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83832 (or 83828 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 1243013240 is about 35256.3928954736. The cubic root of 1243013240 is about 1075.2065916273.

Adding to 1243013240 its reverse (423103421), we get a palindrome (1666116661).

The spelling of 1243013240 in words is "one billion, two hundred forty-three million, thirteen thousand, two hundred forty".