1117728 has 36 divisors (see below), whose sum is σ = 3179358. Its totient is φ = 372480.

The previous prime is 1117709. The next prime is 1117729. The reversal of 1117728 is 8277111.

It can be written as a sum of positive squares in only one way, i.e., 898704 + 219024 = 948^2 + 468^2 .

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

It is not an unprimeable number, because it can be changed into a prime (1117729) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1653 + ... + 2228.

2^1117728 is an apocalyptic number.

1117728 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1117728 is an abundant number, since it is smaller than the sum of its proper divisors (2061630).

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

1117728 is a wasteful number, since it uses less digits than its factorization.

1117728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3897 (or 3886 counting only the distinct ones).

The product of its digits is 784, while the sum is 27.

The square root of 1117728 is about 1057.2265603928. The cubic root of 1117728 is about 103.7796121986.

The spelling of 1117728 in words is "one million, one hundred seventeen thousand, seven hundred twenty-eight".