1028505 has 8 divisors (see below), whose sum is σ = 1645632. Its totient is φ = 548528.

The previous prime is 1028479. The next prime is 1028509. The reversal of 1028505 is 5058201.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1028505 - 2⁵ = 1028473 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1028509) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34269 + ... + 34298.

It is an arithmetic number, because the mean of its divisors is an integer number (205704).

2^1028505 is an apocalyptic number.

1028505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1028505 is a deficient number, since it is larger than the sum of its proper divisors (617127).

1028505 is an equidigital number, since it uses as much as digits as its factorization.

1028505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68575.

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 1028505 is about 1014.1523554181. The cubic root of 1028505 is about 100.9412788094.

The spelling of 1028505 in words is "one million, twenty-eight thousand, five hundred five".