40438709 has 2 divisors, whose sum is σ = 40438710. Its totient is φ = 40438708.

The previous prime is 40438703. The next prime is 40438813. The reversal of 40438709 is 90783404.

40438709 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38254225 + 2184484 = 6185^2 + 1478^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40438709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40438703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20219354 + 20219355.

It is an arithmetic number, because the mean of its divisors is an integer number (20219355).

Almost surely, 2^40438709 is an apocalyptic number.

It is an amenable number.

40438709 is a deficient number, since it is larger than the sum of its proper divisors (1).

40438709 is an equidigital number, since it uses as much as digits as its factorization.

40438709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 40438709 is about 6359.1437316670. The cubic root of 40438709 is about 343.2409490545.

The spelling of 40438709 in words is "forty million, four hundred thirty-eight thousand, seven hundred nine".