1317745730 has 24 divisors (see below), whose sum is σ = 2759199228. Its totient is φ = 451798368.

The previous prime is 1317745711. The next prime is 1317745753. The reversal of 1317745730 is 375477131.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1245172369 + 72573361 = 35287^2 + 8519^2 .

It is a Curzon number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 1344149 + ... + 1345128.

Almost surely, 2^1317745730 is an apocalyptic number.

1317745730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1317745730 is an abundant number, since it is smaller than the sum of its proper divisors (1441453498).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1317745730 is a wasteful number, since it uses less digits than its factorization.

1317745730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2689298 (or 2689291 counting only the distinct ones).

The product of its (nonzero) digits is 61740, while the sum is 38.

The square root of 1317745730 is about 36300.7676227377. The cubic root of 1317745730 is about 1096.3364983644.

The spelling of 1317745730 in words is "one billion, three hundred seventeen million, seven hundred forty-five thousand, seven hundred thirty".