213618 has 8 divisors (see below), whose sum is σ = 427248. Its totient is φ = 71204.

The previous prime is 213613. The next prime is 213623. The reversal of 213618 is 816312.

It is an interprime number because it is at equal distance from previous prime (213613) and next prime (213623).

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

213618 is an admirable number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 213594 and 213603.

It is not an unprimeable number, because it can be changed into a prime (213611) by changing a digit.

213618 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17796 + ... + 17807.

It is an arithmetic number, because the mean of its divisors is an integer number (53406).

2²¹³⁶¹⁸ is an apocalyptic number.

213618 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

213618 is a wasteful number, since it uses less digits than its factorization.

213618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35608.

The product of its digits is 288, while the sum is 21.

The square root of 213618 is about 462.1882733259. The cubic root of 213618 is about 59.7786286947.

The spelling of 213618 in words is "two hundred thirteen thousand, six hundred eighteen".