1881138388 has 12 divisors (see below), whose sum is σ = 3297843360. Its totient is φ = 938897432.

The previous prime is 1881138379. The next prime is 1881138401. The reversal of 1881138388 is 8838311881.

It is a congruent number.

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, 415408 + ... + 419911.

It is an arithmetic number, because the mean of its divisors is an integer number (274820280).

Almost surely, 2^1881138388 is an apocalyptic number.

It is an amenable number.

1881138388 is a deficient number, since it is larger than the sum of its proper divisors (1416704972).

1881138388 is a wasteful number, since it uses less digits than its factorization.

1881138388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 835886 (or 835884 counting only the distinct ones).

The product of its digits is 294912, while the sum is 49.

The square root of 1881138388 is about 43372.0922714134. The cubic root of 1881138388 is about 1234.4502217284.

The spelling of 1881138388 in words is "one billion, eight hundred eighty-one million, one hundred thirty-eight thousand, three hundred eighty-eight".