18383971 has 2 divisors, whose sum is σ = 18383972. Its totient is φ = 18383970.

The previous prime is 18383927. The next prime is 18383977. The reversal of 18383971 is 17938381.

It is a strong prime.

It is an emirp because it is prime and its reverse (17938381) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18383971 is a prime.

It is not a weakly prime, because it can be changed into another prime (18383977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9191985 + 9191986.

It is an arithmetic number, because the mean of its divisors is an integer number (9191986).

Almost surely, 2^18383971 is an apocalyptic number.

18383971 is a deficient number, since it is larger than the sum of its proper divisors (1).

18383971 is an equidigital number, since it uses as much as digits as its factorization.

18383971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 40.

The square root of 18383971 is about 4287.6533208738. The cubic root of 18383971 is about 263.9245412973.

The spelling of 18383971 in words is "eighteen million, three hundred eighty-three thousand, nine hundred seventy-one".