1028905 has 12 divisors (see below), whose sum is σ = 1294020. Its totient is φ = 785312.

The previous prime is 1028903. The next prime is 1028939. The reversal of 1028905 is 5098201.

It can be written as a sum of positive squares in 2 ways, for example, as 304704 + 724201 = 552^2 + 851^2 .

It is not a de Polignac number, because 1028905 - 2¹ = 1028903 is a prime.

1028905 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1028905.

It is not an unprimeable number, because it can be changed into a prime (1028903) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2451 + ... + 2839.

It is an arithmetic number, because the mean of its divisors is an integer number (107835).

2^1028905 is an apocalyptic number.

It is an amenable number.

1028905 is a deficient number, since it is larger than the sum of its proper divisors (265115).

1028905 is an equidigital number, since it uses as much as digits as its factorization.

1028905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440 (or 417 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 1028905 is about 1014.3495452752. The cubic root of 1028905 is about 100.9543629391.

The spelling of 1028905 in words is "one million, twenty-eight thousand, nine hundred five".