212918 has 8 divisors (see below), whose sum is σ = 330480. Its totient is φ = 102760.

The previous prime is 212917. The next prime is 212923. The reversal of 212918 is 819212.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 212893 and 212902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212917) 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, 1778 + ... + 1893.

It is an arithmetic number, because the mean of its divisors is an integer number (41310).

2²¹²⁹¹⁸ is an apocalyptic number.

212918 is a deficient number, since it is larger than the sum of its proper divisors (117562).

212918 is a wasteful number, since it uses less digits than its factorization.

212918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3702.

The product of its digits is 288, while the sum is 23.

The square root of 212918 is about 461.4303847819. The cubic root of 212918 is about 59.7132614964.

The spelling of 212918 in words is "two hundred twelve thousand, nine hundred eighteen".