39998243 has 2 divisors, whose sum is σ = 39998244. Its totient is φ = 39998242.

The previous prime is 39998237. The next prime is 39998251. The reversal of 39998243 is 34289993.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 39998243 - 2⁴ = 39998227 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (39998293) 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, 19999121 + 19999122.

It is an arithmetic number, because the mean of its divisors is an integer number (19999122).

Almost surely, 2^39998243 is an apocalyptic number.

39998243 is a deficient number, since it is larger than the sum of its proper divisors (1).

39998243 is an equidigital number, since it uses as much as digits as its factorization.

39998243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 419904, while the sum is 47.

The square root of 39998243 is about 6324.4164157652. The cubic root of 39998243 is about 341.9901818825.

The spelling of 39998243 in words is "thirty-nine million, nine hundred ninety-eight thousand, two hundred forty-three".