1138618944 has 140 divisors (see below), whose sum is σ = 3393033600. Its totient is φ = 377540352.

The previous prime is 1138618939. The next prime is 1138618961. The reversal of 1138618944 is 4498168311.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 1138618944.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1238517 + ... + 1239435.

Almost surely, 2^1138618944 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 1138618944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1696516800).

1138618944 is an abundant number, since it is smaller than the sum of its proper divisors (2254414656).

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

1138618944 is an equidigital number, since it uses as much as digits as its factorization.

1138618944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1182 (or 1163 counting only the distinct ones).

The product of its digits is 165888, while the sum is 45.

The square root of 1138618944 is about 33743.4281601618. The cubic root of 1138618944 is about 1044.2219108142.

The spelling of 1138618944 in words is "one billion, one hundred thirty-eight million, six hundred eighteen thousand, nine hundred forty-four".