39455993 has 2 divisors, whose sum is σ = 39455994. Its totient is φ = 39455992.

The previous prime is 39455957. The next prime is 39456019. The reversal of 39455993 is 39955493.

39455993 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 can be written as a sum of positive squares in only one way, i.e., 22250089 + 17205904 = 4717^2 + 4148^2 .

It is an emirp because it is prime and its reverse (39955493) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39455993 - 2¹⁰ = 39454969 is a prime.

It is not a weakly prime, because it can be changed into another prime (39455093) 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, 19727996 + 19727997.

It is an arithmetic number, because the mean of its divisors is an integer number (19727997).

Almost surely, 2^39455993 is an apocalyptic number.

It is an amenable number.

39455993 is a deficient number, since it is larger than the sum of its proper divisors (1).

39455993 is an equidigital number, since it uses as much as digits as its factorization.

39455993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 656100, while the sum is 47.

The square root of 39455993 is about 6281.4005603846. The cubic root of 39455993 is about 340.4377090402.

Subtracting 39455993 from its reverse (39955493), we obtain a triangular number (499500 = T₉₉₉).

The spelling of 39455993 in words is "thirty-nine million, four hundred fifty-five thousand, nine hundred ninety-three".