82405643 has 2 divisors, whose sum is σ = 82405644. Its totient is φ = 82405642.

The previous prime is 82405633. The next prime is 82405663. The reversal of 82405643 is 34650428.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 82405643 - 2¹² = 82401547 is a prime.

It is not a weakly prime, because it can be changed into another prime (82405633) 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, 41202821 + 41202822.

It is an arithmetic number, because the mean of its divisors is an integer number (41202822).

Almost surely, 2^82405643 is an apocalyptic number.

82405643 is a deficient number, since it is larger than the sum of its proper divisors (1).

82405643 is an equidigital number, since it uses as much as digits as its factorization.

82405643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23040, while the sum is 32.

The square root of 82405643 is about 9077.7553943692. The cubic root of 82405643 is about 435.1633560954.

The spelling of 82405643 in words is "eighty-two million, four hundred five thousand, six hundred forty-three".