1028725 has 6 divisors (see below), whose sum is σ = 1275650. Its totient is φ = 822960.

The previous prime is 1028683. The next prime is 1028737. The reversal of 1028725 is 5278201.

It can be written as a sum of positive squares in 3 ways, for example, as 529 + 1028196 = 23^2 + 1014^2 .

It is not a de Polignac number, because 1028725 - 2⁷ = 1028597 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 41149 = 1028725 / (1 + 0 + 2 + 8 + 7 + 2 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 1028725.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 20550 + ... + 20599.

2^1028725 is an apocalyptic number.

It is an amenable number.

1028725 is a deficient number, since it is larger than the sum of its proper divisors (246925).

1028725 is an equidigital number, since it uses as much as digits as its factorization.

1028725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41159 (or 41154 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 1028725 is about 1014.2608145837. The cubic root of 1028725 is about 100.9484755004.

The spelling of 1028725 in words is "one million, twenty-eight thousand, seven hundred twenty-five".