1242340133 has 4 divisors (see below), whose sum is σ = 1271231808. Its totient is φ = 1213448460.

The previous prime is 1242340123. The next prime is 1242340181. The reversal of 1242340133 is 3310432421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3310432421 = 25357 ⋅130553.

It is a cyclic number.

It is not a de Polignac number, because 1242340133 - 2⁶ = 1242340069 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1242340099 and 1242340108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242340123) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 14445773 + ... + 14445858.

It is an arithmetic number, because the mean of its divisors is an integer number (317807952).

Almost surely, 2^1242340133 is an apocalyptic number.

It is an amenable number.

1242340133 is a deficient number, since it is larger than the sum of its proper divisors (28891675).

1242340133 is an equidigital number, since it uses as much as digits as its factorization.

1242340133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28891674.

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 1242340133 is about 35246.8457170284. The cubic root of 1242340133 is about 1075.0124773746.

Adding to 1242340133 its reverse (3310432421), we get a palindrome (4552772554).

The spelling of 1242340133 in words is "one billion, two hundred forty-two million, three hundred forty thousand, one hundred thirty-three".