18897019 has 2 divisors, whose sum is σ = 18897020. Its totient is φ = 18897018.

The previous prime is 18897017. The next prime is 18897031. The reversal of 18897019 is 91079881.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18897019 - 2¹ = 18897017 is a prime.

It is a super-2 number, since 2×18897019² = 714194654172722, which contains 22 as substring.

Together with 18897017, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (18897017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9448509 + 9448510.

It is an arithmetic number, because the mean of its divisors is an integer number (9448510).

Almost surely, 2^18897019 is an apocalyptic number.

18897019 is a deficient number, since it is larger than the sum of its proper divisors (1).

18897019 is an equidigital number, since it uses as much as digits as its factorization.

18897019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 43.

The square root of 18897019 is about 4347.0701627648. The cubic root of 18897019 is about 266.3571953323.

The spelling of 18897019 in words is "eighteen million, eight hundred ninety-seven thousand, nineteen".