2221456 has 10 divisors (see below), whose sum is σ = 4304102. Its totient is φ = 1110720.

The previous prime is 2221447. The next prime is 2221459. The reversal of 2221456 is 6541222.

It can be written as a sum of positive squares in only one way, i.e., 1440000 + 781456 = 1200^2 + 884^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69405 + ... + 69436.

2^2221456 is an apocalyptic number.

It is an amenable number.

2221456 is a deficient number, since it is larger than the sum of its proper divisors (2082646).

2221456 is a wasteful number, since it uses less digits than its factorization.

2221456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138849 (or 138843 counting only the distinct ones).

The product of its digits is 960, while the sum is 22.

The square root of 2221456 is about 1490.4549640965. The cubic root of 2221456 is about 130.4805880219.

Adding to 2221456 its reverse (6541222), we get a palindrome (8762678).

The spelling of 2221456 in words is "two million, two hundred twenty-one thousand, four hundred fifty-six".