212638 has 4 divisors (see below), whose sum is σ = 318960. Its totient is φ = 106318.

The previous prime is 212633. The next prime is 212651. The reversal of 212638 is 836212.

212638 is nontrivially palindromic in base 6.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53158 + ... + 53161.

It is an arithmetic number, because the mean of its divisors is an integer number (79740).

2²¹²⁶³⁸ is an apocalyptic number.

212638 is a deficient number, since it is larger than the sum of its proper divisors (106322).

212638 is a wasteful number, since it uses less digits than its factorization.

212638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106321.

The product of its digits is 576, while the sum is 22.

The square root of 212638 is about 461.1268805871. The cubic root of 212638 is about 59.6870745015.

The spelling of 212638 in words is "two hundred twelve thousand, six hundred thirty-eight".