1317520420 has 96 divisors (see below), whose sum is σ = 3029846400. Its totient is φ = 479499264.

The previous prime is 1317520409. The next prime is 1317520433. The reversal of 1317520420 is 240257131.

It is a happy 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 31 ways as a sum of consecutive naturals, for example, 1166416 + ... + 1167544.

It is an arithmetic number, because the mean of its divisors is an integer number (31560900).

Almost surely, 2^1317520420 is an apocalyptic number.

1317520420 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 1317520420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1514923200).

1317520420 is an abundant number, since it is smaller than the sum of its proper divisors (1712325980).

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

1317520420 is a wasteful number, since it uses less digits than its factorization.

1317520420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1277 (or 1275 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 1317520420 is about 36297.6641121712. The cubic root of 1317520420 is about 1096.2740104224.

Adding to 1317520420 its reverse (240257131), we get a palindrome (1557777551).

The spelling of 1317520420 in words is "one billion, three hundred seventeen million, five hundred twenty thousand, four hundred twenty".