40404493 has 2 divisors, whose sum is σ = 40404494. Its totient is φ = 40404492.

The previous prime is 40404457. The next prime is 40404499. The reversal of 40404493 is 39440404.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22915369 + 17489124 = 4787^2 + 4182^2 .

It is a cyclic number.

It is not a de Polignac number, because 40404493 - 2⁹ = 40403981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40404499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20202246 + 20202247.

It is an arithmetic number, because the mean of its divisors is an integer number (20202247).

Almost surely, 2^40404493 is an apocalyptic number.

It is an amenable number.

40404493 is a deficient number, since it is larger than the sum of its proper divisors (1).

40404493 is an equidigital number, since it uses as much as digits as its factorization.

40404493 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 40404493 is about 6356.4528630361. The cubic root of 40404493 is about 343.1441140620.

Adding to 40404493 its reverse (39440404), we get a palindrome (79844897).

The spelling of 40404493 in words is "forty million, four hundred four thousand, four hundred ninety-three".