40823 has 2 divisors, whose sum is σ = 40824. Its totient is φ = 40822.

The previous prime is 40819. The next prime is 40829. The reversal of 40823 is 32804.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40823 - 2² = 40819 is a prime.

It is a Sophie Germain prime.

It is equal to p₄₂₇₄ and since 40823 and 4274 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20411 + 20412.

It is an arithmetic number, because the mean of its divisors is an integer number (20412).

2⁴⁰⁸²³ is an apocalyptic number.

40823 is a deficient number, since it is larger than the sum of its proper divisors (1).

40823 is an equidigital number, since it uses as much as digits as its factorization.

40823 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 40823 is about 202.0470242295. The cubic root of 40823 is about 34.4324801396.

It can be divided in two parts, 4082 and 3, that multiplied together give a triangular number (12246 = T₁₅₆).

The spelling of 40823 in words is "forty thousand, eight hundred twenty-three".