1317745920 has 72 divisors (see below), whose sum is σ = 4208563296. Its totient is φ = 351397888.

The previous prime is 1317745853. The next prime is 1317745927. The reversal of 1317745920 is 295477131.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1317745927) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 167742 + ... + 175421.

It is an arithmetic number, because the mean of its divisors is an integer number (58452268).

Almost surely, 2^1317745920 is an apocalyptic number.

1317745920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1317745920 is an abundant number, since it is smaller than the sum of its proper divisors (2890817376).

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

1317745920 is an equidigital number, since it uses as much as digits as its factorization.

1317745920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343187 (or 343173 counting only the distinct ones).

The product of its (nonzero) digits is 52920, while the sum is 39.

The square root of 1317745920 is about 36300.7702397621. The cubic root of 1317745920 is about 1096.3365510564.

The spelling of 1317745920 in words is "one billion, three hundred seventeen million, seven hundred forty-five thousand, nine hundred twenty".