1718328749 has 4 divisors (see below), whose sum is σ = 1727822460. Its totient is φ = 1708835040.

The previous prime is 1718328743. The next prime is 1718328767. The reversal of 1718328749 is 9478238171.

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 860248900 + 858079849 = 29330^2 + 29293^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1718328749 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1718328697 and 1718328706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1718328743) 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, 4746584 + ... + 4746945.

It is an arithmetic number, because the mean of its divisors is an integer number (431955615).

Almost surely, 2^1718328749 is an apocalyptic number.

It is an amenable number.

1718328749 is a deficient number, since it is larger than the sum of its proper divisors (9493711).

1718328749 is an equidigital number, since it uses as much as digits as its factorization.

1718328749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9493710.

The product of its digits is 677376, while the sum is 50.

The square root of 1718328749 is about 41452.7290898923. The cubic root of 1718328749 is about 1197.7570949166.

The spelling of 1718328749 in words is "one billion, seven hundred eighteen million, three hundred twenty-eight thousand, seven hundred forty-nine".