40239439 has 2 divisors, whose sum is σ = 40239440. Its totient is φ = 40239438.

The previous prime is 40239427. The next prime is 40239467. The reversal of 40239439 is 93493204.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40239439 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40239469) 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, 20119719 + 20119720.

It is an arithmetic number, because the mean of its divisors is an integer number (20119720).

Almost surely, 2^40239439 is an apocalyptic number.

40239439 is a deficient number, since it is larger than the sum of its proper divisors (1).

40239439 is an equidigital number, since it uses as much as digits as its factorization.

40239439 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 34.

The square root of 40239439 is about 6343.4563922203. The cubic root of 40239439 is about 342.6762238036.

The spelling of 40239439 in words is "forty million, two hundred thirty-nine thousand, four hundred thirty-nine".