1128739 has 4 divisors (see below), whose sum is σ = 1131624. Its totient is φ = 1125856.

The previous prime is 1128737. The next prime is 1128761. The reversal of 1128739 is 9378211.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1128739 - 2¹ = 1128737 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

1128739 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1128739.

It is not an unprimeable number, because it can be changed into a prime (1128731) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 742 + ... + 1675.

It is an arithmetic number, because the mean of its divisors is an integer number (282906).

2^1128739 is an apocalyptic number.

1128739 is a deficient number, since it is larger than the sum of its proper divisors (2885).

1128739 is an equidigital number, since it uses as much as digits as its factorization.

1128739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2884.

The product of its digits is 3024, while the sum is 31.

The square root of 1128739 is about 1062.4212912023. The cubic root of 1128739 is about 104.1192849755.

The spelling of 1128739 in words is "one million, one hundred twenty-eight thousand, seven hundred thirty-nine".