40047239 has 2 divisors, whose sum is σ = 40047240. Its totient is φ = 40047238.

The previous prime is 40047197. The next prime is 40047247. The reversal of 40047239 is 93274004.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40047239 - 2⁸ = 40046983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40047299) 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, 20023619 + 20023620.

It is an arithmetic number, because the mean of its divisors is an integer number (20023620).

Almost surely, 2^40047239 is an apocalyptic number.

40047239 is a deficient number, since it is larger than the sum of its proper divisors (1).

40047239 is an equidigital number, since it uses as much as digits as its factorization.

40047239 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 40047239 is about 6328.2887892384. The cubic root of 40047239 is about 342.1297656284.

The spelling of 40047239 in words is "forty million, forty-seven thousand, two hundred thirty-nine".