40030993 has 2 divisors, whose sum is σ = 40030994. Its totient is φ = 40030992.

The previous prime is 40030973. The next prime is 40030999. The reversal of 40030993 is 39903004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40030929 + 64 = 6327^2 + 8^2 .

It is a cyclic number.

It is not a de Polignac number, because 40030993 - 2⁹ = 40030481 is a prime.

It is not a weakly prime, because it can be changed into another prime (40030999) 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, 20015496 + 20015497.

It is an arithmetic number, because the mean of its divisors is an integer number (20015497).

Almost surely, 2^40030993 is an apocalyptic number.

It is an amenable number.

40030993 is a deficient number, since it is larger than the sum of its proper divisors (1).

40030993 is an equidigital number, since it uses as much as digits as its factorization.

40030993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2916, while the sum is 28.

The square root of 40030993 is about 6327.0050576872. The cubic root of 40030993 is about 342.0834953396.

Adding to 40030993 its reverse (39903004), we get a palindrome (79933997).

The spelling of 40030993 in words is "forty million, thirty thousand, nine hundred ninety-three".