213647 has 8 divisors (see below), whose sum is σ = 254976. Its totient is φ = 175032.

The previous prime is 213641. The next prime is 213649. The reversal of 213647 is 746312.

213647 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 cyclic number.

It is not a de Polignac number, because 213647 - 2⁸ = 213391 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 503 + ... + 824.

It is an arithmetic number, because the mean of its divisors is an integer number (31872).

2²¹³⁶⁴⁷ is an apocalyptic number.

213647 is a deficient number, since it is larger than the sum of its proper divisors (41329).

213647 is a wasteful number, since it uses less digits than its factorization.

213647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1357.

The product of its digits is 1008, while the sum is 23.

The square root of 213647 is about 462.2196447578. The cubic root of 213647 is about 59.7813336818.

Adding to 213647 its reverse (746312), we get a palindrome (959959).

The spelling of 213647 in words is "two hundred thirteen thousand, six hundred forty-seven".