18358819 has 2 divisors, whose sum is σ = 18358820. Its totient is φ = 18358818.

The previous prime is 18358817. The next prime is 18358841. The reversal of 18358819 is 91885381.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18358819 - 2¹ = 18358817 is a prime.

It is a super-2 number, since 2×18358819² = 674092470149522, which contains 22 as substring.

Together with 18358817, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (18358817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9179409 + 9179410.

It is an arithmetic number, because the mean of its divisors is an integer number (9179410).

Almost surely, 2^18358819 is an apocalyptic number.

18358819 is a deficient number, since it is larger than the sum of its proper divisors (1).

18358819 is an equidigital number, since it uses as much as digits as its factorization.

18358819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69120, while the sum is 43.

The square root of 18358819 is about 4284.7192440112. The cubic root of 18358819 is about 263.8041237204.

The spelling of 18358819 in words is "eighteen million, three hundred fifty-eight thousand, eight hundred nineteen".