181985042 has 6 divisors (see below), whose sum is σ = 273006183. Its totient is φ = 90982982.

The previous prime is 181985029. The next prime is 181985057. The reversal of 181985042 is 240589181.

181985042 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 90992521 + 90992521 = 9539^2 + 9539^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=9539.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 181984987 and 181985005.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 14309 + ... + 23847.

Almost surely, 2^181985042 is an apocalyptic number.

181985042 is a deficient number, since it is larger than the sum of its proper divisors (91021141).

181985042 is an frugal number, since it uses more digits than its factorization.

181985042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19080 (or 9541 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 38.

The square root of 181985042 is about 13490.1831714770. The cubic root of 181985042 is about 566.6895851553.

The spelling of 181985042 in words is "one hundred eighty-one million, nine hundred eighty-five thousand, forty-two".