18919027 has 2 divisors, whose sum is σ = 18919028. Its totient is φ = 18919026.

The previous prime is 18919013. The next prime is 18919037. The reversal of 18919027 is 72091981.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18919027 - 2¹¹ = 18916979 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18919007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9459513 + 9459514.

It is an arithmetic number, because the mean of its divisors is an integer number (9459514).

Almost surely, 2^18919027 is an apocalyptic number.

18919027 is a deficient number, since it is larger than the sum of its proper divisors (1).

18919027 is an equidigital number, since it uses as much as digits as its factorization.

18919027 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 37.

The square root of 18919027 is about 4349.6007862791. The cubic root of 18919027 is about 266.4605575777.

The spelling of 18919027 in words is "eighteen million, nine hundred nineteen thousand, twenty-seven".