1028723 has 4 divisors (see below), whose sum is σ = 1032528. Its totient is φ = 1024920.

The previous prime is 1028683. The next prime is 1028737. The reversal of 1028723 is 3278201.

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 1028723 - 2¹⁶ = 963187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1028773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1463 + ... + 2048.

It is an arithmetic number, because the mean of its divisors is an integer number (258132).

2^1028723 is an apocalyptic number.

1028723 is a deficient number, since it is larger than the sum of its proper divisors (3805).

1028723 is an equidigital number, since it uses as much as digits as its factorization.

1028723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3804.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 1028723 is about 1014.2598286435. The cubic root of 1028723 is about 100.9484100806.

The spelling of 1028723 in words is "one million, twenty-eight thousand, seven hundred twenty-three".