181942 has 4 divisors (see below), whose sum is σ = 272916. Its totient is φ = 90970.

The previous prime is 181931. The next prime is 181943. The reversal of 181942 is 249181.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45484 + ... + 45487.

It is an arithmetic number, because the mean of its divisors is an integer number (68229).

2¹⁸¹⁹⁴² is an apocalyptic number.

181942 is a deficient number, since it is larger than the sum of its proper divisors (90974).

181942 is an equidigital number, since it uses as much as digits as its factorization.

181942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90973.

The product of its digits is 576, while the sum is 25.

The square root of 181942 is about 426.5465976889. The cubic root of 181942 is about 56.6644904970.

The spelling of 181942 in words is "one hundred eighty-one thousand, nine hundred forty-two".