1318978944 has 128 divisors (see below), whose sum is σ = 3942912000. Its totient is φ = 434004480.

The previous prime is 1318978943. The next prime is 1318978961. The reversal of 1318978944 is 4498798131.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1318978943) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 270609 + ... + 275439.

It is an arithmetic number, because the mean of its divisors is an integer number (30804000).

Almost surely, 2^1318978944 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1318978944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1971456000).

1318978944 is an abundant number, since it is smaller than the sum of its proper divisors (2623933056).

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

1318978944 is an equidigital number, since it uses as much as digits as its factorization.

1318978944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4933 (or 4915 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 54.

The square root of 1318978944 is about 36317.7497100247. The cubic root of 1318978944 is about 1096.6783943626.

The spelling of 1318978944 in words is "one billion, three hundred eighteen million, nine hundred seventy-eight thousand, nine hundred forty-four".