38405723 has 2 divisors, whose sum is σ = 38405724. Its totient is φ = 38405722.

The previous prime is 38405711. The next prime is 38405743. The reversal of 38405723 is 32750483.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 38405723 - 2¹⁶ = 38340187 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 38405723.

It is not a weakly prime, because it can be changed into another prime (38405743) 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, 19202861 + 19202862.

It is an arithmetic number, because the mean of its divisors is an integer number (19202862).

Almost surely, 2^38405723 is an apocalyptic number.

38405723 is a deficient number, since it is larger than the sum of its proper divisors (1).

38405723 is an equidigital number, since it uses as much as digits as its factorization.

38405723 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 32.

The square root of 38405723 is about 6197.2351093048. The cubic root of 38405723 is about 337.3898255838.

The spelling of 38405723 in words is "thirty-eight million, four hundred five thousand, seven hundred twenty-three".