1240345439 has 4 divisors (see below), whose sum is σ = 1244334000. Its totient is φ = 1236356880.

The previous prime is 1240345429. The next prime is 1240345459. The reversal of 1240345439 is 9345430421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9345430421 = 19 ⋅491864759.

It is a cyclic number.

It is not a de Polignac number, because 1240345439 - 2⁴ = 1240345423 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1240345399 and 1240345408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1240345429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1993814 + ... + 1994435.

It is an arithmetic number, because the mean of its divisors is an integer number (311083500).

Almost surely, 2^1240345439 is an apocalyptic number.

1240345439 is a deficient number, since it is larger than the sum of its proper divisors (3988561).

1240345439 is an equidigital number, since it uses as much as digits as its factorization.

1240345439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3988560.

The product of its (nonzero) digits is 51840, while the sum is 35.

The square root of 1240345439 is about 35218.5382859652. The cubic root of 1240345439 is about 1074.4368246091.

The spelling of 1240345439 in words is "one billion, two hundred forty million, three hundred forty-five thousand, four hundred thirty-nine".