2213978 has 16 divisors (see below), whose sum is σ = 3787560. Its totient is φ = 961536.

The previous prime is 2213977. The next prime is 2213983. The reversal of 2213978 is 8793122.

It can be written as a sum of positive squares in 4 ways, for example, as 1787569 + 426409 = 1337^2 + 653^2 .

It is a d-powerful number, because it can be written as 2¹³ + 2²¹ + 1 + 3¹⁰ + 9 + 7⁵ + 8⁵ .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2213971) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2063 + ... + 2946.

2^2213978 is an apocalyptic number.

2213978 is a deficient number, since it is larger than the sum of its proper divisors (1573582).

2213978 is a wasteful number, since it uses less digits than its factorization.

2213978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5041.

The product of its digits is 6048, while the sum is 32.

The square root of 2213978 is about 1487.9442193846. The cubic root of 2213978 is about 130.3340128707.

The spelling of 2213978 in words is "two million, two hundred thirteen thousand, nine hundred seventy-eight".