1317217920 has 64 divisors (see below), whose sum is σ = 4198638240. Its totient is φ = 351257600.

The previous prime is 1317217901. The next prime is 1317217927. The reversal of 1317217920 is 297127131.

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

It is not an unprimeable number, because it can be changed into a prime (1317217927) by changing a digit.

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, 341106 + ... + 344945.

Almost surely, 2^1317217920 is an apocalyptic number.

1317217920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1317217920 is an abundant number, since it is smaller than the sum of its proper divisors (2881420320).

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

1317217920 is an equidigital number, since it uses as much as digits as its factorization.

1317217920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 686073 (or 686061 counting only the distinct ones).

The product of its (nonzero) digits is 5292, while the sum is 33.

The square root of 1317217920 is about 36293.4969381568. The cubic root of 1317217920 is about 1096.1901032419.

The spelling of 1317217920 in words is "one billion, three hundred seventeen million, two hundred seventeen thousand, nine hundred twenty".