18982643 has 2 divisors, whose sum is σ = 18982644. Its totient is φ = 18982642.

The previous prime is 18982637. The next prime is 18982657. The reversal of 18982643 is 34628981.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18982643 - 2⁴ = 18982627 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18982643.

It is not a weakly prime, because it can be changed into another prime (18982043) 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, 9491321 + 9491322.

It is an arithmetic number, because the mean of its divisors is an integer number (9491322).

Almost surely, 2^18982643 is an apocalyptic number.

18982643 is a deficient number, since it is larger than the sum of its proper divisors (1).

18982643 is an equidigital number, since it uses as much as digits as its factorization.

18982643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 82944, while the sum is 41.

The square root of 18982643 is about 4356.9075041823. The cubic root of 18982643 is about 266.7588849458.

The spelling of 18982643 in words is "eighteen million, nine hundred eighty-two thousand, six hundred forty-three".