212687 has 4 divisors (see below), whose sum is σ = 225216. Its totient is φ = 200160.

The previous prime is 212683. The next prime is 212701. The reversal of 212687 is 786212.

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

It is a cyclic number.

It is not a de Polignac number, because 212687 - 2² = 212683 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6239 + ... + 6272.

It is an arithmetic number, because the mean of its divisors is an integer number (56304).

2²¹²⁶⁸⁷ is an apocalyptic number.

212687 is a deficient number, since it is larger than the sum of its proper divisors (12529).

212687 is a wasteful number, since it uses less digits than its factorization.

212687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12528.

The product of its digits is 1344, while the sum is 26.

The square root of 212687 is about 461.1800082397. The cubic root of 212687 is about 59.6916588844.

Adding to 212687 its reverse (786212), we get a palindrome (998899).

The spelling of 212687 in words is "two hundred twelve thousand, six hundred eighty-seven".