1221456 has 20 divisors (see below), whose sum is σ = 3155552. Its totient is φ = 407136.

The previous prime is 1221449. The next prime is 1221457. The reversal of 1221456 is 6541221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221457) 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, 12676 + ... + 12771.

2^1221456 is an apocalyptic number.

1221456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1221456 is an abundant number, since it is smaller than the sum of its proper divisors (1934096).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221456 is a wasteful number, since it uses less digits than its factorization.

1221456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25458 (or 25452 counting only the distinct ones).

The product of its digits is 480, while the sum is 21.

The square root of 1221456 is about 1105.1950054176. The cubic root of 1221456 is about 106.8954637467.

Adding to 1221456 its reverse (6541221), we get a palindrome (7762677).

The spelling of 1221456 in words is "one million, two hundred twenty-one thousand, four hundred fifty-six".