18943079 has 2 divisors, whose sum is σ = 18943080. Its totient is φ = 18943078.

The previous prime is 18943037. The next prime is 18943081. The reversal of 18943079 is 97034981.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (97034981) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18943079 is a prime.

It is a Sophie Germain prime.

Together with 18943081, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18943579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9471539 + 9471540.

It is an arithmetic number, because the mean of its divisors is an integer number (9471540).

Almost surely, 2^18943079 is an apocalyptic number.

18943079 is a deficient number, since it is larger than the sum of its proper divisors (1).

18943079 is an equidigital number, since it uses as much as digits as its factorization.

18943079 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 18943079 is about 4352.3647595302. The cubic root of 18943079 is about 266.5734279936.

The spelling of 18943079 in words is "eighteen million, nine hundred forty-three thousand, seventy-nine".