181994043 has 48 divisors (see below), whose sum is σ = 309666560. Its totient is φ = 93044160.

The previous prime is 181994003. The next prime is 181994051. The reversal of 181994043 is 340499181.

It is not a de Polignac number, because 181994043 - 2¹⁸ = 181731899 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 181993992 and 181994010.

It is not an unprimeable number, because it can be changed into a prime (181994003) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 169713 + ... + 170781.

Almost surely, 2^181994043 is an apocalyptic number.

181994043 is a deficient number, since it is larger than the sum of its proper divisors (127672517).

181994043 is a wasteful number, since it uses less digits than its factorization.

181994043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1168 (or 1157 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 181994043 is about 13490.5167803165. The cubic root of 181994043 is about 566.6989278442.

The spelling of 181994043 in words is "one hundred eighty-one million, nine hundred ninety-four thousand, forty-three".