1002855 has 16 divisors (see below), whose sum is σ = 1833984. Its totient is φ = 458400.

The previous prime is 1002853. The next prime is 1002857. The reversal of 1002855 is 5582001.

1002855 = T₁₄₆ + T₁₄₇ + ... + T₂₀₈.

It is an interprime number because it is at equal distance from previous prime (1002853) and next prime (1002857).

It is not a de Polignac number, because 1002855 - 2¹ = 1002853 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1002851) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 4671 + ... + 4880.

It is an arithmetic number, because the mean of its divisors is an integer number (114624).

2^1002855 is an apocalyptic number.

1002855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1002855 is a deficient number, since it is larger than the sum of its proper divisors (831129).

1002855 is an equidigital number, since it uses as much as digits as its factorization.

1002855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9566.

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

The square root of 1002855 is about 1001.4264825737. The cubic root of 1002855 is about 100.0950762431.

Adding to 1002855 its reverse (5582001), we get a palindrome (6584856).

The spelling of 1002855 in words is "one million, two thousand, eight hundred fifty-five".