1128784 has 10 divisors (see below), whose sum is σ = 2187050. Its totient is φ = 564384.

The previous prime is 1128781. The next prime is 1128811. The reversal of 1128784 is 4878211.

It can be written as a sum of positive squares in only one way, i.e., 1123600 + 5184 = 1060^2 + 72^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1128781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35259 + ... + 35290.

It is an arithmetic number, because the mean of its divisors is an integer number (218705).

2^1128784 is an apocalyptic number.

It is an amenable number.

1128784 is a deficient number, since it is larger than the sum of its proper divisors (1058266).

1128784 is an equidigital number, since it uses as much as digits as its factorization.

1128784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70557 (or 70551 counting only the distinct ones).

The product of its digits is 3584, while the sum is 31.

The square root of 1128784 is about 1062.4424690307. The cubic root of 1128784 is about 104.1206686156.

Subtracting from 1128784 its sum of digits (31), we obtain a triangular number (1128753 = T₁₅₀₂).

The spelling of 1128784 in words is "one million, one hundred twenty-eight thousand, seven hundred eighty-four".