40404593 has 2 divisors, whose sum is σ = 40404594. Its totient is φ = 40404592.

The previous prime is 40404587. The next prime is 40404613. The reversal of 40404593 is 39540404.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21464689 + 18939904 = 4633^2 + 4352^2 .

It is a cyclic number.

It is not a de Polignac number, because 40404593 - 2¹⁰ = 40403569 is a prime.

It is a super-2 number, since 2×40404593² = 3265062270991298, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (40404523) 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, 20202296 + 20202297.

It is an arithmetic number, because the mean of its divisors is an integer number (20202297).

Almost surely, 2^40404593 is an apocalyptic number.

It is an amenable number.

40404593 is a deficient number, since it is larger than the sum of its proper divisors (1).

40404593 is an equidigital number, since it uses as much as digits as its factorization.

40404593 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 40404593 is about 6356.4607290536. The cubic root of 40404593 is about 343.1443971525.

Adding to 40404593 its reverse (39540404), we get a palindrome (79944997).

The spelling of 40404593 in words is "forty million, four hundred four thousand, five hundred ninety-three".