39945973 has 2 divisors, whose sum is σ = 39945974. Its totient is φ = 39945972.

The previous prime is 39945967. The next prime is 39946001. The reversal of 39945973 is 37954993.

39945973 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39652209 + 293764 = 6297^2 + 542^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39945973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39945943) 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, 19972986 + 19972987.

It is an arithmetic number, because the mean of its divisors is an integer number (19972987).

Almost surely, 2^39945973 is an apocalyptic number.

It is an amenable number.

39945973 is a deficient number, since it is larger than the sum of its proper divisors (1).

39945973 is an equidigital number, since it uses as much as digits as its factorization.

39945973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 918540, while the sum is 49.

The square root of 39945973 is about 6320.2826677293. The cubic root of 39945973 is about 341.8411451759.

The spelling of 39945973 in words is "thirty-nine million, nine hundred forty-five thousand, nine hundred seventy-three".