1028815 has 4 divisors (see below), whose sum is σ = 1234584. Its totient is φ = 823048.

The previous prime is 1028809. The next prime is 1028837. The reversal of 1028815 is 5188201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5188201 = 263 ⋅19727.

It is a cyclic number.

It is not a de Polignac number, because 1028815 - 2⁹ = 1028303 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1028815.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102877 + ... + 102886.

It is an arithmetic number, because the mean of its divisors is an integer number (308646).

2^1028815 is an apocalyptic number.

1028815 is a deficient number, since it is larger than the sum of its proper divisors (205769).

1028815 is an equidigital number, since it uses as much as digits as its factorization.

1028815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205768.

The product of its (nonzero) digits is 640, while the sum is 25.

The square root of 1028815 is about 1014.3051808997. The cubic root of 1028815 is about 100.9514193056.

The spelling of 1028815 in words is "one million, twenty-eight thousand, eight hundred fifteen".