181490 has 8 divisors (see below), whose sum is σ = 326700. Its totient is φ = 72592.

The previous prime is 181459. The next prime is 181499. The reversal of 181490 is 94181.

181490 = T₁₄₈ + T₁₄₉ + ... + T₁₆₂.

181490 is digitally balanced in base 2, 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 2 ways, for example, as 175561 + 5929 = 419^2 + 77^2 .

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

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

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 181490.

It is not an unprimeable number, because it can be changed into a prime (181499) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9065 + ... + 9084.

2¹⁸¹⁴⁹⁰ is an apocalyptic number.

181490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

181490 is a deficient number, since it is larger than the sum of its proper divisors (145210).

181490 is a wasteful number, since it uses less digits than its factorization.

181490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18156.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 181490 is about 426.0164316080. The cubic root of 181490 is about 56.6175275661.

The spelling of 181490 in words is "one hundred eighty-one thousand, four hundred ninety".