18938147 has 2 divisors, whose sum is σ = 18938148. Its totient is φ = 18938146.

The previous prime is 18938141. The next prime is 18938149. The reversal of 18938147 is 74183981.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18938147 - 2⁶ = 18938083 is a prime.

Together with 18938149, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18938141) 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, 9469073 + 9469074.

It is an arithmetic number, because the mean of its divisors is an integer number (9469074).

Almost surely, 2^18938147 is an apocalyptic number.

18938147 is a deficient number, since it is larger than the sum of its proper divisors (1).

18938147 is an equidigital number, since it uses as much as digits as its factorization.

18938147 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 41.

The square root of 18938147 is about 4351.7981341050. The cubic root of 18938147 is about 266.5502910604.

The spelling of 18938147 in words is "eighteen million, nine hundred thirty-eight thousand, one hundred forty-seven".