40819 has 2 divisors, whose sum is σ = 40820. Its totient is φ = 40818.

The previous prime is 40813. The next prime is 40823. The reversal of 40819 is 91804.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40819 - 2⁵ = 40787 is a prime.

It is a super-2 number, since 2×40819² = 3332381522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 40819.

It is not a weakly prime, because it can be changed into another prime (40813) by changing a digit.

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

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20409 + 20410.

It is an arithmetic number, because the mean of its divisors is an integer number (20410).

2⁴⁰⁸¹⁹ is an apocalyptic number.

40819 is a deficient number, since it is larger than the sum of its proper divisors (1).

40819 is an equidigital number, since it uses as much as digits as its factorization.

40819 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 40819 is about 202.0371253013. The cubic root of 40819 is about 34.4313554924.

The spelling of 40819 in words is "forty thousand, eight hundred nineteen".