40811 has 4 divisors (see below), whose sum is σ = 41952. Its totient is φ = 39672.

The previous prime is 40801. The next prime is 40813. The reversal of 40811 is 11804.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a 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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 515 + ... + 588.

It is an arithmetic number, because the mean of its divisors is an integer number (10488).

2⁴⁰⁸¹¹ is an apocalyptic number.

40811 is a deficient number, since it is larger than the sum of its proper divisors (1141).

40811 is a wasteful number, since it uses less digits than its factorization.

40811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1140.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 40811 is about 202.0173259896. The cubic root of 40811 is about 34.4291059775.

The spelling of 40811 in words is "forty thousand, eight hundred eleven".