1138581928 has 24 divisors (see below), whose sum is σ = 2346562890. Its totient is φ = 517536800.

The previous prime is 1138581893. The next prime is 1138581937. The reversal of 1138581928 is 8291858311.

It can be written as a sum of positive squares in only one way, i.e., 1044453124 + 94128804 = 32318^2 + 9702^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 587143 + ... + 589078.

Almost surely, 2^1138581928 is an apocalyptic number.

It is an amenable number.

1138581928 is an abundant number, since it is smaller than the sum of its proper divisors (1207980962).

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

1138581928 is a wasteful number, since it uses less digits than its factorization.

1138581928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1176249 (or 1176234 counting only the distinct ones).

The product of its digits is 138240, while the sum is 46.

The square root of 1138581928 is about 33742.8796637157. The cubic root of 1138581928 is about 1044.2105949602.

The spelling of 1138581928 in words is "one billion, one hundred thirty-eight million, five hundred eighty-one thousand, nine hundred twenty-eight".