40036993 has 2 divisors, whose sum is σ = 40036994. Its totient is φ = 40036992.

The previous prime is 40036981. The next prime is 40037021. The reversal of 40036993 is 39963004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26553409 + 13483584 = 5153^2 + 3672^2 .

It is a cyclic number.

It is not a de Polignac number, because 40036993 - 2²⁵ = 6482561 is a prime.

It is not a weakly prime, because it can be changed into another prime (40036093) 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, 20018496 + 20018497.

It is an arithmetic number, because the mean of its divisors is an integer number (20018497).

Almost surely, 2^40036993 is an apocalyptic number.

It is an amenable number.

40036993 is a deficient number, since it is larger than the sum of its proper divisors (1).

40036993 is an equidigital number, since it uses as much as digits as its factorization.

40036993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17496, while the sum is 34.

The square root of 40036993 is about 6327.4791979113. The cubic root of 40036993 is about 342.1005854180.

Adding to 40036993 its reverse (39963004), we get a palindrome (79999997).

The spelling of 40036993 in words is "forty million, thirty-six thousand, nine hundred ninety-three".