18982657 has 2 divisors, whose sum is σ = 18982658. Its totient is φ = 18982656.

The previous prime is 18982643. The next prime is 18982661. The reversal of 18982657 is 75628981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18974736 + 7921 = 4356^2 + 89^2 .

It is an emirp because it is prime and its reverse (75628981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18982657 - 2¹⁹ = 18458369 is a prime.

It is not a weakly prime, because it can be changed into another prime (18982627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9491328 + 9491329.

It is an arithmetic number, because the mean of its divisors is an integer number (9491329).

Almost surely, 2^18982657 is an apocalyptic number.

It is an amenable number.

18982657 is a deficient number, since it is larger than the sum of its proper divisors (1).

18982657 is an equidigital number, since it uses as much as digits as its factorization.

18982657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 241920, while the sum is 46.

The square root of 18982657 is about 4356.9091108262. The cubic root of 18982657 is about 266.7589505254.

The spelling of 18982657 in words is "eighteen million, nine hundred eighty-two thousand, six hundred fifty-seven".