39945943 has 2 divisors, whose sum is σ = 39945944. Its totient is φ = 39945942.

The previous prime is 39945907. The next prime is 39945947. The reversal of 39945943 is 34954993.

39945943 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (34954993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39945943 - 2⁹ = 39945431 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 39945893 and 39945902.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39945947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19972971 + 19972972.

It is an arithmetic number, because the mean of its divisors is an integer number (19972972).

Almost surely, 2^39945943 is an apocalyptic number.

39945943 is a deficient number, since it is larger than the sum of its proper divisors (1).

39945943 is an equidigital number, since it uses as much as digits as its factorization.

39945943 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 524880, while the sum is 46.

The square root of 39945943 is about 6320.2802944173. The cubic root of 39945943 is about 341.8410596000.

The spelling of 39945943 in words is "thirty-nine million, nine hundred forty-five thousand, nine hundred forty-three".