40440013 has 2 divisors, whose sum is σ = 40440014. Its totient is φ = 40440012.

The previous prime is 40439977. The next prime is 40440017. The reversal of 40440013 is 31004404.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39980329 + 459684 = 6323^2 + 678^2 .

It is a cyclic number.

It is not a de Polignac number, because 40440013 - 2¹⁷ = 40308941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40440017) 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, 20220006 + 20220007.

It is an arithmetic number, because the mean of its divisors is an integer number (20220007).

Almost surely, 2^40440013 is an apocalyptic number.

It is an amenable number.

40440013 is a deficient number, since it is larger than the sum of its proper divisors (1).

40440013 is an equidigital number, since it uses as much as digits as its factorization.

40440013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 40440013 is about 6359.2462603677. The cubic root of 40440013 is about 343.2446384352.

Adding to 40440013 its reverse (31004404), we get a palindrome (71444417).

The spelling of 40440013 in words is "forty million, four hundred forty thousand, thirteen".