218019 has 4 divisors (see below), whose sum is σ = 290696. Its totient is φ = 145344.

The previous prime is 218003. The next prime is 218021. The reversal of 218019 is 910812.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 218019 - 2⁴ = 218003 is a prime.

It is a super-2 number, since 2×218019² = 95064568722, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 217986 and 218004.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 218019.

It is not an unprimeable number, because it can be changed into a prime (218069) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36334 + ... + 36339.

It is an arithmetic number, because the mean of its divisors is an integer number (72674).

2²¹⁸⁰¹⁹ is an apocalyptic number.

218019 is a deficient number, since it is larger than the sum of its proper divisors (72677).

218019 is an equidigital number, since it uses as much as digits as its factorization.

218019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72676.

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 218019 is about 466.9250475183. The cubic root of 218019 is about 60.1863649800.

The spelling of 218019 in words is "two hundred eighteen thousand, nineteen".