213634 has 8 divisors (see below), whose sum is σ = 322560. Its totient is φ = 106116.

The previous prime is 213623. The next prime is 213637. The reversal of 213634 is 436312.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213637) 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, 207 + ... + 685.

It is an arithmetic number, because the mean of its divisors is an integer number (40320).

2²¹³⁶³⁴ is an apocalyptic number.

213634 is a deficient number, since it is larger than the sum of its proper divisors (108926).

213634 is a wasteful number, since it uses less digits than its factorization.

213634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 704.

The product of its digits is 432, while the sum is 19.

The square root of 213634 is about 462.2055819654. The cubic root of 213634 is about 59.7801211316.

Adding to 213634 its reverse (436312), we get a palindrome (649946).

It can be divided in two parts, 21 and 3634, that added together give a triangular number (3655 = T₈₅).

The spelling of 213634 in words is "two hundred thirteen thousand, six hundred thirty-four".