1003855 has 4 divisors (see below), whose sum is σ = 1204632. Its totient is φ = 803080.

The previous prime is 1003841. The next prime is 1003879. The reversal of 1003855 is 5583001.

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

It is not a de Polignac number, because 1003855 - 2¹¹ = 1001807 is a prime.

It is a super-2 number, since 2×1003855² = 2015449722050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

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, 100381 + ... + 100390.

It is an arithmetic number, because the mean of its divisors is an integer number (301158).

2^1003855 is an apocalyptic number.

1003855 is a deficient number, since it is larger than the sum of its proper divisors (200777).

1003855 is an equidigital number, since it uses as much as digits as its factorization.

1003855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200776.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 1003855 is about 1001.9256459438. The cubic root of 1003855 is about 100.1283352302.

Adding to 1003855 its reverse (5583001), we get a palindrome (6586856).

The spelling of 1003855 in words is "one million, three thousand, eight hundred fifty-five".