2221378 has 8 divisors (see below), whose sum is σ = 3339468. Its totient is φ = 1108224.

The previous prime is 2221343. The next prime is 2221379. The reversal of 2221378 is 8731222.

It can be written as a sum of positive squares in 2 ways, for example, as 2082249 + 139129 = 1443^2 + 373^2 .

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

It is not an unprimeable number, because it can be changed into a prime (2221379) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 250 + ... + 2122.

2^2221378 is an apocalyptic number.

2221378 is a deficient number, since it is larger than the sum of its proper divisors (1118090).

2221378 is a wasteful number, since it uses less digits than its factorization.

2221378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2468.

The product of its digits is 1344, while the sum is 25.

The square root of 2221378 is about 1490.4287973600. The cubic root of 2221378 is about 130.4790608546.

It can be divided in two parts, 222 and 1378, that added together give a square (1600 = 40²).

The spelling of 2221378 in words is "two million, two hundred twenty-one thousand, three hundred seventy-eight".