1240661717 has 4 divisors (see below), whose sum is σ = 1313641836. Its totient is φ = 1167681600.

The previous prime is 1240661711. The next prime is 1240661743. The reversal of 1240661717 is 7171660421.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 936298801 + 304362916 = 30599^2 + 17446^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1240661717 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 (1240661711) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36490034 + ... + 36490067.

It is an arithmetic number, because the mean of its divisors is an integer number (328410459).

Almost surely, 2^1240661717 is an apocalyptic number.

1240661717 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1240661717 is a deficient number, since it is larger than the sum of its proper divisors (72980119).

1240661717 is an equidigital number, since it uses as much as digits as its factorization.

1240661717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72980118.

The product of its (nonzero) digits is 14112, while the sum is 35.

The square root of 1240661717 is about 35223.0282201857. The cubic root of 1240661717 is about 1074.5281410654.

The spelling of 1240661717 in words is "one billion, two hundred forty million, six hundred sixty-one thousand, seven hundred seventeen".