1138738328 has 64 divisors (see below), whose sum is σ = 2664990720. Its totient is φ = 444124800.

The previous prime is 1138738327. The next prime is 1138738333. The reversal of 1138738328 is 8238378311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1138738327) 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, 40673 + ... + 62703.

It is an arithmetic number, because the mean of its divisors is an integer number (41640480).

Almost surely, 2^1138738328 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 1138738328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1332495360).

1138738328 is an abundant number, since it is smaller than the sum of its proper divisors (1526252392).

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

1138738328 is a wasteful number, since it uses less digits than its factorization.

1138738328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22128 (or 22124 counting only the distinct ones).

The product of its digits is 193536, while the sum is 44.

The square root of 1138738328 is about 33745.1971101074. The cubic root of 1138738328 is about 1044.2584050345.

The spelling of 1138738328 in words is "one billion, one hundred thirty-eight million, seven hundred thirty-eight thousand, three hundred twenty-eight".