1318488720 has 160 divisors (see below), whose sum is σ = 4377576960. Its totient is φ = 327106560.

The previous prime is 1318488713. The next prime is 1318488733. The reversal of 1318488720 is 278848131.

It is a Cunningham number, because it is equal to 36311²-1.

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, 361305 + ... + 364935.

It is an arithmetic number, because the mean of its divisors is an integer number (27359856).

Almost surely, 2^1318488720 is an apocalyptic number.

1318488720 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 1318488720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2188788480).

1318488720 is an abundant number, since it is smaller than the sum of its proper divisors (3059088240).

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

1318488720 is a wasteful number, since it uses less digits than its factorization.

1318488720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3753 (or 3747 counting only the distinct ones).

The product of its (nonzero) digits is 86016, while the sum is 42.

The square root of 1318488720 is about 36310.9999862301. Note that the first 4 decimals coincide. The cubic root of 1318488720 is about 1096.5425102909.

The spelling of 1318488720 in words is "one billion, three hundred eighteen million, four hundred eighty-eight thousand, seven hundred twenty".