1004855 has 4 divisors (see below), whose sum is σ = 1205832. Its totient is φ = 803880.

The previous prime is 1004797. The next prime is 1004873. The reversal of 1004855 is 5584001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5584001 = 61 ⋅91541.

It is not a de Polignac number, because 1004855 - 2⁸ = 1004599 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 1004855.

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 3 ways as a sum of consecutive naturals, for example, 100481 + ... + 100490.

It is an arithmetic number, because the mean of its divisors is an integer number (301458).

2^1004855 is an apocalyptic number.

1004855 is a deficient number, since it is larger than the sum of its proper divisors (200977).

1004855 is an equidigital number, since it uses as much as digits as its factorization.

1004855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200976.

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 1004855 is about 1002.4245607526. The cubic root of 1004855 is about 100.1615721372.

Adding to 1004855 its reverse (5584001), we get a palindrome (6588856).

The spelling of 1004855 in words is "one million, four thousand, eight hundred fifty-five".