1138281138 has 48 divisors (see below), whose sum is σ = 2644462080. Its totient is φ = 352579968.

The previous prime is 1138281107. The next prime is 1138281143. The reversal of 1138281138 is 8311828311.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 631 + ... + 47717.

It is an arithmetic number, because the mean of its divisors is an integer number (55092960).

Almost surely, 2^1138281138 is an apocalyptic number.

1138281138 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1138281138, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1322231040).

1138281138 is an abundant number, since it is smaller than the sum of its proper divisors (1506180942).

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

1138281138 is a wasteful number, since it uses less digits than its factorization.

1138281138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47191 (or 47188 counting only the distinct ones).

The product of its digits is 9216, while the sum is 36.

The square root of 1138281138 is about 33738.4222808358. The cubic root of 1138281138 is about 1044.1186338521.

The spelling of 1138281138 in words is "one billion, one hundred thirty-eight million, two hundred eighty-one thousand, one hundred thirty-eight".