83640847 has 2 divisors, whose sum is σ = 83640848. Its totient is φ = 83640846.

The previous prime is 83640839. The next prime is 83640923. The reversal of 83640847 is 74804638.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 83640847 - 2³ = 83640839 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 (83640047) 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, 41820423 + 41820424.

It is an arithmetic number, because the mean of its divisors is an integer number (41820424).

Almost surely, 2^83640847 is an apocalyptic number.

83640847 is a deficient number, since it is larger than the sum of its proper divisors (1).

83640847 is an equidigital number, since it uses as much as digits as its factorization.

83640847 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 129024, while the sum is 40.

The square root of 83640847 is about 9145.5369989957. The cubic root of 83640847 is about 437.3268487047.

The spelling of 83640847 in words is "eighty-three million, six hundred forty thousand, eight hundred forty-seven".