8140439 has 2 divisors, whose sum is σ = 8140440. Its totient is φ = 8140438.

The previous prime is 8140421. The next prime is 8140441. The reversal of 8140439 is 9340418.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8140439 - 2¹² = 8136343 is a prime.

It is a super-2 number, since 2×8140439² = 132533494225442, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 8140441, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8140409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4070219 + 4070220.

It is an arithmetic number, because the mean of its divisors is an integer number (4070220).

Almost surely, 2^8140439 is an apocalyptic number.

8140439 is a deficient number, since it is larger than the sum of its proper divisors (1).

8140439 is an equidigital number, since it uses as much as digits as its factorization.

8140439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 8140439 is about 2853.1454572103. The cubic root of 8140439 is about 201.1635427147.

The spelling of 8140439 in words is "eight million, one hundred forty thousand, four hundred thirty-nine".