212978 has 8 divisors (see below), whose sum is σ = 323568. Its totient is φ = 105124.

The previous prime is 212969. The next prime is 212981. The reversal of 212978 is 879212.

It is a happy number.

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

It is a plaindrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 212978.

It is an unprimeable number.

212978 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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, 476 + ... + 807.

It is an arithmetic number, because the mean of its divisors is an integer number (40446).

2²¹²⁹⁷⁸ is an apocalyptic number.

212978 is a deficient number, since it is larger than the sum of its proper divisors (110590).

212978 is a wasteful number, since it uses less digits than its factorization.

212978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1368.

The product of its digits is 2016, while the sum is 29.

The square root of 212978 is about 461.4953954266. The cubic root of 212978 is about 59.7188700079.

The spelling of 212978 in words is "two hundred twelve thousand, nine hundred seventy-eight".