40005923 has 2 divisors, whose sum is σ = 40005924. Its totient is φ = 40005922.

The previous prime is 40005907. The next prime is 40005941. The reversal of 40005923 is 32950004.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40005923 - 2⁴ = 40005907 is a prime.

It is not a weakly prime, because it can be changed into another prime (40005023) 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, 20002961 + 20002962.

It is an arithmetic number, because the mean of its divisors is an integer number (20002962).

Almost surely, 2^40005923 is an apocalyptic number.

40005923 is a deficient number, since it is larger than the sum of its proper divisors (1).

40005923 is an equidigital number, since it uses as much as digits as its factorization.

40005923 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 40005923 is about 6325.0235572684. The cubic root of 40005923 is about 342.0120688148.

Adding to 40005923 its reverse (32950004), we get a palindrome (72955927).

The spelling of 40005923 in words is "forty million, five thousand, nine hundred twenty-three".