1317344640 has 64 divisors (see below), whose sum is σ = 4199042160. Its totient is φ = 351291392.

The previous prime is 1317344629. The next prime is 1317344669. The reversal of 1317344640 is 464437131.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 341139 + ... + 344978.

Almost surely, 2^1317344640 is an apocalyptic number.

1317344640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1317344640 is an abundant number, since it is smaller than the sum of its proper divisors (2881697520).

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

1317344640 is an equidigital number, since it uses as much as digits as its factorization.

1317344640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 686139 (or 686127 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 33.

The square root of 1317344640 is about 36295.2426634676. The cubic root of 1317344640 is about 1096.2252542860.

The spelling of 1317344640 in words is "one billion, three hundred seventeen million, three hundred forty-four thousand, six hundred forty".