1028197 has 4 divisors (see below), whose sum is σ = 1037740. Its totient is φ = 1018656.

The previous prime is 1028191. The next prime is 1028201. The reversal of 1028197 is 7918201.

It is a Cunningham number, because it is equal to 1014²+1.

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

It can be written as a sum of positive squares in 2 ways, for example, as 715716 + 312481 = 846^2 + 559^2 .

It is a cyclic number.

It is not a de Polignac number, because 1028197 - 2³ = 1028189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1028191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4608 + ... + 4825.

It is an arithmetic number, because the mean of its divisors is an integer number (259435).

2^1028197 is an apocalyptic number.

It is an amenable number.

1028197 is a deficient number, since it is larger than the sum of its proper divisors (9543).

1028197 is an equidigital number, since it uses as much as digits as its factorization.

1028197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9542.

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 1028197 is about 1014.0004930965. Note that the first 3 decimals coincide. The cubic root of 1028197 is about 100.9312017176.

It can be divided in two parts, 1028 and 197, that added together give a triangular number (1225 = T₄₉).

The spelling of 1028197 in words is "one million, twenty-eight thousand, one hundred ninety-seven".