40423 has 2 divisors, whose sum is σ = 40424.
Its totient is φ = 40422.
The previous prime is 40387. The next prime is 40427. The reversal of 40423 is 32404.
It is a strong prime.
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-40423 is a prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (40427) 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, 20211 + 20212.
It is an arithmetic number, because the mean of its divisors is an integer number (20212).
240423 is an apocalyptic number.
40423 is a deficient number, since it is larger than the sum of its proper divisors (1).
40423 is an equidigital number, since it uses as much as digits as its factorization.
40423 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 96, while the sum is 13.
The square root of 40423 is about 201.0547189200.
The cubic root of 40423 is about 34.3196497665.
Adding to 40423 its reverse (32404), we get a palindrome (72827).
The spelling of 40423 in words is "forty thousand, four hundred twenty-three", and thus it is an iban number.