181442 has 8 divisors (see below), whose sum is σ = 273996. Its totient is φ = 90112.

The previous prime is 181439. The next prime is 181457. The reversal of 181442 is 244181.

181442 is nontrivially palindromic in base 16.

It can be written as a sum of positive squares in 2 ways, for example, as 167281 + 14161 = 409^2 + 119^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 338 + ... + 690.

2¹⁸¹⁴⁴² is an apocalyptic number.

181442 is a deficient number, since it is larger than the sum of its proper divisors (92554).

181442 is a wasteful number, since it uses less digits than its factorization.

181442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 612.

The product of its digits is 256, while the sum is 20.

The square root of 181442 is about 425.9600920274. The cubic root of 181442 is about 56.6125357742.

The spelling of 181442 in words is "one hundred eighty-one thousand, four hundred forty-two".