18983971 has 2 divisors, whose sum is σ = 18983972. Its totient is φ = 18983970.

The previous prime is 18983963. The next prime is 18983989. The reversal of 18983971 is 17938981.

It is a weak prime.

It is an emirp because it is prime and its reverse (17938981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18983971 - 2³ = 18983963 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18983171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9491985 + 9491986.

It is an arithmetic number, because the mean of its divisors is an integer number (9491986).

Almost surely, 2^18983971 is an apocalyptic number.

18983971 is a deficient number, since it is larger than the sum of its proper divisors (1).

18983971 is an equidigital number, since it uses as much as digits as its factorization.

18983971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 46.

The square root of 18983971 is about 4357.0599031916. The cubic root of 18983971 is about 266.7651054975.

The spelling of 18983971 in words is "eighteen million, nine hundred eighty-three thousand, nine hundred seventy-one".