83966639 has 2 divisors, whose sum is σ = 83966640. Its totient is φ = 83966638.

The previous prime is 83966563. The next prime is 83966669. The reversal of 83966639 is 93666938.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 83966639 - 2²⁰ = 82918063 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (83966669) 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, 41983319 + 41983320.

It is an arithmetic number, because the mean of its divisors is an integer number (41983320).

Almost surely, 2^83966639 is an apocalyptic number.

83966639 is a deficient number, since it is larger than the sum of its proper divisors (1).

83966639 is an equidigital number, since it uses as much as digits as its factorization.

83966639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1259712, while the sum is 50.

The square root of 83966639 is about 9163.3312174121. The cubic root of 83966639 is about 437.8939280823.

The spelling of 83966639 in words is "eighty-three million, nine hundred sixty-six thousand, six hundred thirty-nine".