212939 has 4 divisors (see below), whose sum is σ = 219840. Its totient is φ = 206040.

The previous prime is 212923. The next prime is 212969. The reversal of 212939 is 939212.

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 212939 - 2⁴ = 212923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212909) 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, 3404 + ... + 3465.

It is an arithmetic number, because the mean of its divisors is an integer number (54960).

2²¹²⁹³⁹ is an apocalyptic number.

212939 is a deficient number, since it is larger than the sum of its proper divisors (6901).

212939 is an equidigital number, since it uses as much as digits as its factorization.

212939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6900.

The product of its digits is 972, while the sum is 26.

The square root of 212939 is about 461.4531395494. The cubic root of 212939 is about 59.7152245953.

It can be divided in two parts, 2 and 12939, that multiplied together give a triangular number (25878 = T₂₂₇).

The spelling of 212939 in words is "two hundred twelve thousand, nine hundred thirty-nine".