1881396388 has 12 divisors (see below), whose sum is σ = 3295126912. Its totient is φ = 939931560.

The previous prime is 1881396331. The next prime is 1881396457. The reversal of 1881396388 is 8836931881.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 186120 + ... + 195967.

Almost surely, 2^1881396388 is an apocalyptic number.

It is an amenable number.

1881396388 is a deficient number, since it is larger than the sum of its proper divisors (1413730524).

1881396388 is a wasteful number, since it uses less digits than its factorization.

1881396388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383322 (or 383320 counting only the distinct ones).

The product of its digits is 1990656, while the sum is 55.

The square root of 1881396388 is about 43375.0664322258. The cubic root of 1881396388 is about 1234.5066545069.

The spelling of 1881396388 in words is "one billion, eight hundred eighty-one million, three hundred ninety-six thousand, three hundred eighty-eight".