1317800640 has 224 divisors, whose sum is σ = 4702795776. Its totient is φ = 310210560.

The previous prime is 1317800597. The next prime is 1317800677. The reversal of 1317800640 is 460087131.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1317800598 and 1317800607.

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 31 ways as a sum of consecutive naturals, for example, 284745 + ... + 289335.

It is an arithmetic number, because the mean of its divisors is an integer number (20994624).

Almost surely, 2^1317800640 is an apocalyptic number.

1317800640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1317800640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2351397888).

1317800640 is an abundant number, since it is smaller than the sum of its proper divisors (3384995136).

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

1317800640 is a wasteful number, since it uses less digits than its factorization.

1317800640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4647 (or 4637 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 1317800640 is about 36301.5239349535. The cubic root of 1317800640 is about 1096.3517261380.

Adding to 1317800640 its reverse (460087131), we get a palindrome (1777887771).

The spelling of 1317800640 in words is "one billion, three hundred seventeen million, eight hundred thousand, six hundred forty".