213844 has 12 divisors (see below), whose sum is σ = 377524. Its totient is φ = 105984.

The previous prime is 213833. The next prime is 213847. The reversal of 213844 is 448312.

It can be written as a sum of positive squares in 2 ways, for example, as 44100 + 169744 = 210^2 + 412^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213847) 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, 634 + ... + 910.

2²¹³⁸⁴⁴ is an apocalyptic number.

It is an amenable number.

213844 is a deficient number, since it is larger than the sum of its proper divisors (163680).

213844 is a wasteful number, since it uses less digits than its factorization.

213844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474 (or 472 counting only the distinct ones).

The product of its digits is 768, while the sum is 22.

The square root of 213844 is about 462.4326978059. The cubic root of 213844 is about 59.7997024627.

The spelling of 213844 in words is "two hundred thirteen thousand, eight hundred forty-four".