1138839138 has 24 divisors (see below), whose sum is σ = 2597353200. Its totient is φ = 359633304.

The previous prime is 1138839137. The next prime is 1138839151. The reversal of 1138839138 is 8319388311.

It is a junction number, because it is equal to n+sod(n) for n = 1138839093 and 1138839102.

It is not an unprimeable number, because it can be changed into a prime (1138839137) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1664628 + ... + 1665311.

It is an arithmetic number, because the mean of its divisors is an integer number (108223050).

Almost surely, 2^1138839138 is an apocalyptic number.

1138839138 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1138839138 is an abundant number, since it is smaller than the sum of its proper divisors (1458514062).

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

1138839138 is a wasteful number, since it uses less digits than its factorization.

1138839138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3329966 (or 3329963 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The square root of 1138839138 is about 33746.6907710964. The cubic root of 1138839138 is about 1044.2892194253.

The spelling of 1138839138 in words is "one billion, one hundred thirty-eight million, eight hundred thirty-nine thousand, one hundred thirty-eight".