181396 has 12 divisors (see below), whose sum is σ = 321300. Its totient is φ = 89600.

The previous prime is 181387. The next prime is 181397. The reversal of 181396 is 693181.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 148996 + 32400 = 386^2 + 180^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181397) by changing a digit.

181396 is an untouchable number, because it is not equal to the sum of proper divisors of any 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, 180 + ... + 628.

It is an arithmetic number, because the mean of its divisors is an integer number (26775).

2¹⁸¹³⁹⁶ is an apocalyptic number.

It is an amenable number.

181396 is a deficient number, since it is larger than the sum of its proper divisors (139904).

181396 is a wasteful number, since it uses less digits than its factorization.

181396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 554 (or 552 counting only the distinct ones).

The product of its digits is 1296, while the sum is 28.

The square root of 181396 is about 425.9060929360. The cubic root of 181396 is about 56.6077511475.

It can be divided in two parts, 18139 and 6, that added together give a triangular number (18145 = T₁₉₀).

The spelling of 181396 in words is "one hundred eighty-one thousand, three hundred ninety-six".