1128729 has 16 divisors (see below), whose sum is σ = 1751040. Its totient is φ = 633360.

The previous prime is 1128727. The next prime is 1128731. The reversal of 1128729 is 9278211.

It is an interprime number because it is at equal distance from previous prime (1128727) and next prime (1128731).

It is not a de Polignac number, because 1128729 - 2¹ = 1128727 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1128696 and 1128705.

It is not an unprimeable number, because it can be changed into a prime (1128727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 784 + ... + 1694.

It is an arithmetic number, because the mean of its divisors is an integer number (109440).

2^1128729 is an apocalyptic number.

It is an amenable number.

1128729 is a deficient number, since it is larger than the sum of its proper divisors (622311).

1128729 is an equidigital number, since it uses as much as digits as its factorization.

1128729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 980.

The product of its digits is 2016, while the sum is 30.

The square root of 1128729 is about 1062.4165849609. The cubic root of 1128729 is about 104.1189774949.

The spelling of 1128729 in words is "one million, one hundred twenty-eight thousand, seven hundred twenty-nine".