1221128 has 8 divisors (see below), whose sum is σ = 2289630. Its totient is φ = 610560.

The previous prime is 1221119. The next prime is 1221131. The reversal of 1221128 is 8211221.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1214404 + 6724 = 1102^2 + 82^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 76313 + ... + 76328.

2^1221128 is an apocalyptic number.

It is an amenable number.

1221128 is a deficient number, since it is larger than the sum of its proper divisors (1068502).

1221128 is a wasteful number, since it uses less digits than its factorization.

1221128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152647 (or 152643 counting only the distinct ones).

The product of its digits is 64, while the sum is 17.

The square root of 1221128 is about 1105.0466053520. The cubic root of 1221128 is about 106.8858946066.

Adding to 1221128 its reverse (8211221), we get a palindrome (9432349).

The spelling of 1221128 in words is "one million, two hundred twenty-one thousand, one hundred twenty-eight".