40824221 has 2 divisors, whose sum is σ = 40824222. Its totient is φ = 40824220.

The previous prime is 40824169. The next prime is 40824227. The reversal of 40824221 is 12242804.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40819321 + 4900 = 6389^2 + 70^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40824221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40824227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20412110 + 20412111.

It is an arithmetic number, because the mean of its divisors is an integer number (20412111).

Almost surely, 2^40824221 is an apocalyptic number.

It is an amenable number.

40824221 is a deficient number, since it is larger than the sum of its proper divisors (1).

40824221 is an equidigital number, since it uses as much as digits as its factorization.

40824221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1024, while the sum is 23.

The square root of 40824221 is about 6389.3834600844. The cubic root of 40824221 is about 344.3282342351.

The spelling of 40824221 in words is "forty million, eight hundred twenty-four thousand, two hundred twenty-one".