1881181388 has 12 divisors (see below), whose sum is σ = 3331731480. Its totient is φ = 929258112.

The previous prime is 1881181373. The next prime is 1881181409. The reversal of 1881181388 is 8831811881.

It is a hoax number, since the sum of its digits (47) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2832773 + ... + 2833436.

It is an arithmetic number, because the mean of its divisors is an integer number (277644290).

Almost surely, 2^1881181388 is an apocalyptic number.

It is an amenable number.

1881181388 is a deficient number, since it is larger than the sum of its proper divisors (1450550092).

1881181388 is a wasteful number, since it uses less digits than its factorization.

1881181388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5666296 (or 5666294 counting only the distinct ones).

The product of its digits is 98304, while the sum is 47.

The square root of 1881181388 is about 43372.5879790450. The cubic root of 1881181388 is about 1234.4596275498.

The spelling of 1881181388 in words is "one billion, eight hundred eighty-one million, one hundred eighty-one thousand, three hundred eighty-eight".