1228928 has 16 divisors (see below), whose sum is σ = 2448510. Its totient is φ = 614400.

The previous prime is 1228919. The next prime is 1228937. The reversal of 1228928 is 8298221.

It is an interprime number because it is at equal distance from previous prime (1228919) and next prime (1228937).

It can be written as a sum of positive squares in only one way, i.e., 906304 + 322624 = 952^2 + 568^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 1228894 and 1228903.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4673 + ... + 4928.

2^1228928 is an apocalyptic number.

It is an amenable number.

1228928 is a deficient number, since it is larger than the sum of its proper divisors (1219582).

1228928 is an frugal number, since it uses more digits than its factorization.

1228928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9615 (or 9603 counting only the distinct ones).

The product of its digits is 4608, while the sum is 32.

The square root of 1228928 is about 1108.5702503676. The cubic root of 1228928 is about 107.1129909560.

The spelling of 1228928 in words is "one million, two hundred twenty-eight thousand, nine hundred twenty-eight".