40189 has 2 divisors, whose sum is σ = 40190. Its totient is φ = 40188.

The previous prime is 40177. The next prime is 40193. The reversal of 40189 is 98104.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22500 + 17689 = 150^2 + 133^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40189 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20094 + 20095.

It is an arithmetic number, because the mean of its divisors is an integer number (20095).

2⁴⁰¹⁸⁹ is an apocalyptic number.

It is an amenable number.

40189 is a deficient number, since it is larger than the sum of its proper divisors (1).

40189 is an equidigital number, since it uses as much as digits as its factorization.

40189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 40189 is about 200.4719431741. The cubic root of 40189 is about 34.2532985617.

The spelling of 40189 in words is "forty thousand, one hundred eighty-nine".