39281993 has 4 divisors (see below), whose sum is σ = 39687060. Its totient is φ = 38876928.

The previous prime is 39281981. The next prime is 39282011. The reversal of 39281993 is 39918293.

39281993 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7382089 + 31899904 = 2717^2 + 5648^2 .

It is a cyclic number.

It is not a de Polignac number, because 39281993 - 2¹² = 39277897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39281923) 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 in 3 ways as a sum of consecutive naturals, for example, 202388 + ... + 202581.

It is an arithmetic number, because the mean of its divisors is an integer number (9921765).

Almost surely, 2^39281993 is an apocalyptic number.

It is an amenable number.

39281993 is a deficient number, since it is larger than the sum of its proper divisors (405067).

39281993 is an equidigital number, since it uses as much as digits as its factorization.

39281993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405066.

The product of its digits is 104976, while the sum is 44.

The square root of 39281993 is about 6267.5348423443. The cubic root of 39281993 is about 339.9365308286.

The spelling of 39281993 in words is "thirty-nine million, two hundred eighty-one thousand, nine hundred ninety-three".