39289993 has 2 divisors, whose sum is σ = 39289994. Its totient is φ = 39289992.

The previous prime is 39289981. The next prime is 39289997. The reversal of 39289993 is 39998293.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35557369 + 3732624 = 5963^2 + 1932^2 .

It is an emirp because it is prime and its reverse (39998293) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39289993 - 2⁵ = 39289961 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 39289993.

It is not a weakly prime, because it can be changed into another prime (39289997) 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, 19644996 + 19644997.

It is an arithmetic number, because the mean of its divisors is an integer number (19644997).

Almost surely, 2^39289993 is an apocalyptic number.

It is an amenable number.

39289993 is a deficient number, since it is larger than the sum of its proper divisors (1).

39289993 is an equidigital number, since it uses as much as digits as its factorization.

39289993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 944784, while the sum is 52.

The square root of 39289993 is about 6268.1730193095. The cubic root of 39289993 is about 339.9596059278.

The spelling of 39289993 in words is "thirty-nine million, two hundred eighty-nine thousand, nine hundred ninety-three".