212378 has 4 divisors (see below), whose sum is σ = 318570. Its totient is φ = 106188.

The previous prime is 212369. The next prime is 212383. The reversal of 212378 is 873212.

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

It can be written as a sum of positive squares in only one way, i.e., 196249 + 16129 = 443^2 + 127^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53093 + ... + 53096.

2²¹²³⁷⁸ is an apocalyptic number.

212378 is a deficient number, since it is larger than the sum of its proper divisors (106192).

212378 is a wasteful number, since it uses less digits than its factorization.

212378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106191.

The product of its digits is 672, while the sum is 23.

The square root of 212378 is about 460.8448762870. The cubic root of 212378 is about 59.6627374142.

The spelling of 212378 in words is "two hundred twelve thousand, three hundred seventy-eight".