8242639 has 2 divisors, whose sum is σ = 8242640. Its totient is φ = 8242638.

The previous prime is 8242631. The next prime is 8242667. The reversal of 8242639 is 9362428.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8242639 - 2³ = 8242631 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8242631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4121319 + 4121320.

It is an arithmetic number, because the mean of its divisors is an integer number (4121320).

Almost surely, 2^8242639 is an apocalyptic number.

8242639 is a deficient number, since it is larger than the sum of its proper divisors (1).

8242639 is an equidigital number, since it uses as much as digits as its factorization.

8242639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 34.

The square root of 8242639 is about 2870.9996516893. Note that the first 3 decimals coincide. The cubic root of 8242639 is about 202.0018870523.

The spelling of 8242639 in words is "eight million, two hundred forty-two thousand, six hundred thirty-nine".