213818 has 8 divisors (see below), whose sum is σ = 349920. Its totient is φ = 97180.

The previous prime is 213799. The next prime is 213821. The reversal of 213818 is 818312.

213818 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 213793 and 213802.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 213818.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4838 + ... + 4881.

It is an arithmetic number, because the mean of its divisors is an integer number (43740).

2²¹³⁸¹⁸ is an apocalyptic number.

213818 is a deficient number, since it is larger than the sum of its proper divisors (136102).

213818 is a wasteful number, since it uses less digits than its factorization.

213818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9732.

The product of its digits is 384, while the sum is 23.

The square root of 213818 is about 462.4045847524. The cubic root of 213818 is about 59.7972788030.

The spelling of 213818 in words is "two hundred thirteen thousand, eight hundred eighteen".