39939943 has 2 divisors, whose sum is σ = 39939944. Its totient is φ = 39939942.

The previous prime is 39939929. The next prime is 39939959. The reversal of 39939943 is 34993993.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (34993993) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39939943 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39939343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19969971 + 19969972.

It is an arithmetic number, because the mean of its divisors is an integer number (19969972).

Almost surely, 2^39939943 is an apocalyptic number.

39939943 is a deficient number, since it is larger than the sum of its proper divisors (1).

39939943 is an equidigital number, since it uses as much as digits as its factorization.

39939943 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 708588, while the sum is 49.

The square root of 39939943 is about 6319.8056140992. The cubic root of 39939943 is about 341.8239435601.

The spelling of 39939943 in words is "thirty-nine million, nine hundred thirty-nine thousand, nine hundred forty-three".