18966019 has 2 divisors, whose sum is σ = 18966020. Its totient is φ = 18966018.

The previous prime is 18966011. The next prime is 18966037. The reversal of 18966019 is 91066981.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18966019 - 2³ = 18966011 is a prime.

It is a super-2 number, since 2×18966019² = 719419753416722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18966011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9483009 + 9483010.

It is an arithmetic number, because the mean of its divisors is an integer number (9483010).

Almost surely, 2^18966019 is an apocalyptic number.

18966019 is a deficient number, since it is larger than the sum of its proper divisors (1).

18966019 is an equidigital number, since it uses as much as digits as its factorization.

18966019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 18966019 is about 4354.9993111366. Note that the first 3 decimals coincide. The cubic root of 18966019 is about 266.6809910708.

The spelling of 18966019 in words is "eighteen million, nine hundred sixty-six thousand, nineteen".