2212978 has 4 divisors (see below), whose sum is σ = 3319470. Its totient is φ = 1106488.

The previous prime is 2212967. The next prime is 2212979. The reversal of 2212978 is 8792122.

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., 2199289 + 13689 = 1483^2 + 117^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (2212979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 553243 + ... + 553246.

2^2212978 is an apocalyptic number.

2212978 is a deficient number, since it is larger than the sum of its proper divisors (1106492).

2212978 is a wasteful number, since it uses less digits than its factorization.

2212978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1106491.

The product of its digits is 4032, while the sum is 31.

The square root of 2212978 is about 1487.6081473291. The cubic root of 2212978 is about 130.3143870146.

The spelling of 2212978 in words is "two million, two hundred twelve thousand, nine hundred seventy-eight".