1138892388 has 12 divisors (see below), whose sum is σ = 2657415600. Its totient is φ = 379630792.

The previous prime is 1138892273. The next prime is 1138892401. The reversal of 1138892388 is 8832988311.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 1138892388.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47453838 + ... + 47453861.

It is an arithmetic number, because the mean of its divisors is an integer number (221451300).

Almost surely, 2^1138892388 is an apocalyptic number.

It is an amenable number.

1138892388 is an abundant number, since it is smaller than the sum of its proper divisors (1518523212).

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

1138892388 is a wasteful number, since it uses less digits than its factorization.

1138892388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94907706 (or 94907704 counting only the distinct ones).

The product of its digits is 663552, while the sum is 51.

The square root of 1138892388 is about 33747.4797281219. The cubic root of 1138892388 is about 1044.3054955122.

The spelling of 1138892388 in words is "one billion, one hundred thirty-eight million, eight hundred ninety-two thousand, three hundred eighty-eight".