40731239 has 2 divisors, whose sum is σ = 40731240. Its totient is φ = 40731238.

The previous prime is 40731233. The next prime is 40731287. The reversal of 40731239 is 93213704.

40731239 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 is a cyclic number.

It is not a de Polignac number, because 40731239 - 2⁸ = 40730983 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 (40731233) 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, 20365619 + 20365620.

It is an arithmetic number, because the mean of its divisors is an integer number (20365620).

Almost surely, 2^40731239 is an apocalyptic number.

40731239 is a deficient number, since it is larger than the sum of its proper divisors (1).

40731239 is an equidigital number, since it uses as much as digits as its factorization.

40731239 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 29.

The square root of 40731239 is about 6382.1030232988. The cubic root of 40731239 is about 344.0666193988.

The spelling of 40731239 in words is "forty million, seven hundred thirty-one thousand, two hundred thirty-nine".