1318889940 has 96 divisors (see below), whose sum is σ = 3899925120. Its totient is φ = 332107776.

The previous prime is 1318889917. The next prime is 1318889941. The reversal of 1318889940 is 499888131.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1318889941) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 382464 + ... + 385896.

It is an arithmetic number, because the mean of its divisors is an integer number (40624220).

Almost surely, 2^1318889940 is an apocalyptic number.

1318889940 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 1318889940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1949962560).

1318889940 is an abundant number, since it is smaller than the sum of its proper divisors (2581035180).

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

1318889940 is a wasteful number, since it uses less digits than its factorization.

1318889940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3801 (or 3799 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 51.

The square root of 1318889940 is about 36316.5243381026. The cubic root of 1318889940 is about 1096.6537260488.

The spelling of 1318889940 in words is "one billion, three hundred eighteen million, eight hundred eighty-nine thousand, nine hundred forty".