1221748 has 12 divisors (see below), whose sum is σ = 2332512. Its totient is φ = 555320.

The previous prime is 1221707. The next prime is 1221749. The reversal of 1221748 is 8471221.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221749) 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, 13840 + ... + 13927.

It is an arithmetic number, because the mean of its divisors is an integer number (194376).

2^1221748 is an apocalyptic number.

It is an amenable number.

1221748 is a deficient number, since it is larger than the sum of its proper divisors (1110764).

1221748 is a wasteful number, since it uses less digits than its factorization.

1221748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27782 (or 27780 counting only the distinct ones).

The product of its digits is 896, while the sum is 25.

The square root of 1221748 is about 1105.3271009072. The cubic root of 1221748 is about 106.9039811742.

Adding to 1221748 its reverse (8471221), we get a palindrome (9692969).

The spelling of 1221748 in words is "one million, two hundred twenty-one thousand, seven hundred forty-eight".