181894 has 4 divisors (see below), whose sum is σ = 272844. Its totient is φ = 90946.

The previous prime is 181891. The next prime is 181903. The reversal of 181894 is 498181.

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

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45472 + ... + 45475.

It is an arithmetic number, because the mean of its divisors is an integer number (68211).

2¹⁸¹⁸⁹⁴ is an apocalyptic number.

181894 is a deficient number, since it is larger than the sum of its proper divisors (90950).

181894 is an equidigital number, since it uses as much as digits as its factorization.

181894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90949.

The product of its digits is 2304, while the sum is 31.

The square root of 181894 is about 426.4903281436. The cubic root of 181894 is about 56.6595069770.

The spelling of 181894 in words is "one hundred eighty-one thousand, eight hundred ninety-four".