65840839 has 2 divisors, whose sum is σ = 65840840. Its totient is φ = 65840838.

The previous prime is 65840837. The next prime is 65840851. The reversal of 65840839 is 93804856.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 65840839 - 2¹ = 65840837 is a prime.

Together with 65840837, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 65840795 and 65840804.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65840837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32920419 + 32920420.

It is an arithmetic number, because the mean of its divisors is an integer number (32920420).

Almost surely, 2^65840839 is an apocalyptic number.

65840839 is a deficient number, since it is larger than the sum of its proper divisors (1).

65840839 is an equidigital number, since it uses as much as digits as its factorization.

65840839 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 207360, while the sum is 43.

The square root of 65840839 is about 8114.2368094603. The cubic root of 65840839 is about 403.7988881556.

The spelling of 65840839 in words is "sixty-five million, eight hundred forty thousand, eight hundred thirty-nine".