212906 has 4 divisors (see below), whose sum is σ = 319362. Its totient is φ = 106452.

The previous prime is 212903. The next prime is 212909. The reversal of 212906 is 609212.

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

It is an interprime number because it is at equal distance from previous prime (212903) and next prime (212909).

It can be written as a sum of positive squares in only one way, i.e., 152881 + 60025 = 391^2 + 245^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (212903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53225 + ... + 53228.

2²¹²⁹⁰⁶ is an apocalyptic number.

212906 is a deficient number, since it is larger than the sum of its proper divisors (106456).

212906 is a wasteful number, since it uses less digits than its factorization.

212906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106455.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 212906 is about 461.4173815538. The cubic root of 212906 is about 59.7121396676.

The spelling of 212906 in words is "two hundred twelve thousand, nine hundred six".