40309993 has 2 divisors, whose sum is σ = 40309994. Its totient is φ = 40309992.

The previous prime is 40309991. The next prime is 40310027. The reversal of 40309993 is 39990304.

40309993 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., 24920064 + 15389929 = 4992^2 + 3923^2 .

It is a cyclic number.

It is not a de Polignac number, because 40309993 - 2¹ = 40309991 is a prime.

Together with 40309991, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (40309991) 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, 20154996 + 20154997.

It is an arithmetic number, because the mean of its divisors is an integer number (20154997).

Almost surely, 2^40309993 is an apocalyptic number.

It is an amenable number.

40309993 is a deficient number, since it is larger than the sum of its proper divisors (1).

40309993 is an equidigital number, since it uses as much as digits as its factorization.

40309993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26244, while the sum is 37.

The square root of 40309993 is about 6349.0151204734. The cubic root of 40309993 is about 342.8763844939.

The spelling of 40309993 in words is "forty million, three hundred nine thousand, nine hundred ninety-three".