1240789159 has 4 divisors (see below), whose sum is σ = 1241511016. Its totient is φ = 1240067304.

The previous prime is 1240789127. The next prime is 1240789169. The reversal of 1240789159 is 9519870421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9519870421 = 1117 ⋅8522713.

It is a cyclic number.

It is not a de Polignac number, because 1240789159 - 2⁵ = 1240789127 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 (1240789169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 358344 + ... + 361789.

It is an arithmetic number, because the mean of its divisors is an integer number (310377754).

Almost surely, 2^1240789159 is an apocalyptic number.

1240789159 is a deficient number, since it is larger than the sum of its proper divisors (721857).

1240789159 is an equidigital number, since it uses as much as digits as its factorization.

1240789159 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 721856.

The product of its (nonzero) digits is 181440, while the sum is 46.

The square root of 1240789159 is about 35224.8372458980. The cubic root of 1240789159 is about 1074.5649320039.

The spelling of 1240789159 in words is "one billion, two hundred forty million, seven hundred eighty-nine thousand, one hundred fifty-nine".