18938299 has 2 divisors, whose sum is σ = 18938300. Its totient is φ = 18938298.

The previous prime is 18938291. The next prime is 18938419. The reversal of 18938299 is 99283981.

18938299 is nontrivially palindromic in base 13.

It is a weak prime.

It is an emirp because it is prime and its reverse (99283981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18938299 - 2³ = 18938291 is a prime.

It is not a weakly prime, because it can be changed into another prime (18938291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9469149 + 9469150.

It is an arithmetic number, because the mean of its divisors is an integer number (9469150).

Almost surely, 2^18938299 is an apocalyptic number.

18938299 is a deficient number, since it is larger than the sum of its proper divisors (1).

18938299 is an equidigital number, since it uses as much as digits as its factorization.

18938299 is an evil number, because the sum of its binary digits is even.

The product of its digits is 279936, while the sum is 49.

The square root of 18938299 is about 4351.8155981153. The cubic root of 18938299 is about 266.5510041807.

The spelling of 18938299 in words is "eighteen million, nine hundred thirty-eight thousand, two hundred ninety-nine".