1128221638 has 8 divisors (see below), whose sum is σ = 1695188088. Its totient is φ = 563158944.

The previous prime is 1128221629. The next prime is 1128221651. The reversal of 1128221638 is 8361228211.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 474456 + ... + 476827.

It is an arithmetic number, because the mean of its divisors is an integer number (211898511).

Almost surely, 2^1128221638 is an apocalyptic number.

1128221638 is a deficient number, since it is larger than the sum of its proper divisors (566966450).

1128221638 is an equidigital number, since it uses as much as digits as its factorization.

1128221638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 951878.

The product of its digits is 9216, while the sum is 34.

The square root of 1128221638 is about 33589.0106731353. The cubic root of 1128221638 is about 1041.0337471523.

Adding to 1128221638 its reverse (8361228211), we get a palindrome (9489449849).

The spelling of 1128221638 in words is "one billion, one hundred twenty-eight million, two hundred twenty-one thousand, six hundred thirty-eight".