218419 has 2 divisors, whose sum is σ = 218420. Its totient is φ = 218418.

The previous prime is 218417. The next prime is 218423. The reversal of 218419 is 914812.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 218419 - 2¹ = 218417 is a prime.

It is a super-2 number, since 2×218419² = 95413719122, which contains 22 as substring.

Together with 218417, it forms a pair of twin primes.

It is equal to p₁₉₄₇₄ and since 218419 and 19474 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 218393 and 218402.

It is not a weakly prime, because it can be changed into another prime (218417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109209 + 109210.

It is an arithmetic number, because the mean of its divisors is an integer number (109210).

2²¹⁸⁴¹⁹ is an apocalyptic number.

218419 is a deficient number, since it is larger than the sum of its proper divisors (1).

218419 is an equidigital number, since it uses as much as digits as its factorization.

218419 is an evil number, because the sum of its binary digits is even.

The product of its digits is 576, while the sum is 25.

The square root of 218419 is about 467.3531855032. The cubic root of 218419 is about 60.2231505167.

The spelling of 218419 in words is "two hundred eighteen thousand, four hundred nineteen".