40309439 has 2 divisors, whose sum is σ = 40309440. Its totient is φ = 40309438.

The previous prime is 40309433. The next prime is 40309453. The reversal of 40309439 is 93490304.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40309439 - 2⁸ = 40309183 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40309433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20154719 + 20154720.

It is an arithmetic number, because the mean of its divisors is an integer number (20154720).

Almost surely, 2^40309439 is an apocalyptic number.

40309439 is a deficient number, since it is larger than the sum of its proper divisors (1).

40309439 is an equidigital number, since it uses as much as digits as its factorization.

40309439 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 32.

The square root of 40309439 is about 6348.9714915095. The cubic root of 40309439 is about 342.8748137139.

The spelling of 40309439 in words is "forty million, three hundred nine thousand, four hundred thirty-nine".