389090189881 has 12 divisors (see below), whose sum is σ = 398670532500. Its totient is φ = 379735050240.

The previous prime is 389090189867. The next prime is 389090189903. The reversal of 389090189881 is 188981090983.

It can be written as a sum of positive squares in 2 ways, for example, as 189102349881 + 199987840000 = 434859^2 + 447200^2 .

It is not a de Polignac number, because 389090189881 - 2⁷ = 389090189753 is a prime.

It is a super-2 number, since 2×389090189881² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (389090187881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2225161 + ... + 2393641.

It is an arithmetic number, because the mean of its divisors is an integer number (33222544375).

Almost surely, 2^389090189881 is an apocalyptic number.

It is an amenable number.

389090189881 is a deficient number, since it is larger than the sum of its proper divisors (9580342619).

389090189881 is a wasteful number, since it uses less digits than its factorization.

389090189881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169816 (or 169773 counting only the distinct ones).

The product of its (nonzero) digits is 8957952, while the sum is 64.

The spelling of 389090189881 in words is "three hundred eighty-nine billion, ninety million, one hundred eighty-nine thousand, eight hundred eighty-one".