1243240013 has 8 divisors (see below), whose sum is σ = 1248383136. Its totient is φ = 1238108400.

The previous prime is 1243240001. The next prime is 1243240043. The reversal of 1243240013 is 3100423421.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1243240013 - 2¹⁴ = 1243223629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243240043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 260870 + ... + 265592.

It is an arithmetic number, because the mean of its divisors is an integer number (156047892).

Almost surely, 2^1243240013 is an apocalyptic number.

It is an amenable number.

1243240013 is a deficient number, since it is larger than the sum of its proper divisors (5143123).

1243240013 is an equidigital number, since it uses as much as digits as its factorization.

1243240013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5755.

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

The square root of 1243240013 is about 35259.6088038424. The cubic root of 1243240013 is about 1075.2719738748.

Adding to 1243240013 its reverse (3100423421), we get a palindrome (4343663434).

The spelling of 1243240013 in words is "one billion, two hundred forty-three million, two hundred forty thousand, thirteen".