1128420 has 36 divisors (see below), whose sum is σ = 3423420. Its totient is φ = 300864.

The previous prime is 1128397. The next prime is 1128427. The reversal of 1128420 is 248211.

It can be written as a sum of positive squares in 2 ways, for example, as 381924 + 746496 = 618^2 + 864^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1128393 and 1128402.

It is not an unprimeable number, because it can be changed into a prime (1128427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2955 + ... + 3314.

It is an arithmetic number, because the mean of its divisors is an integer number (95095).

2^1128420 is an apocalyptic number.

1128420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1128420 is an abundant number, since it is smaller than the sum of its proper divisors (2295000).

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

1128420 is a wasteful number, since it uses less digits than its factorization.

1128420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6284 (or 6279 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 1128420 is about 1062.2711518252. The cubic root of 1128420 is about 104.1094754502.

The spelling of 1128420 in words is "one million, one hundred twenty-eight thousand, four hundred twenty".