1002845 has 4 divisors (see below), whose sum is σ = 1203420. Its totient is φ = 802272.

The previous prime is 1002821. The next prime is 1002851. The reversal of 1002845 is 5482001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5482001 = 7 ⋅783143.

It can be written as a sum of positive squares in 2 ways, for example, as 273529 + 729316 = 523^2 + 854^2 .

It is a cyclic number.

It is not a de Polignac number, because 1002845 - 2¹⁰ = 1001821 is a prime.

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, 100280 + ... + 100289.

It is an arithmetic number, because the mean of its divisors is an integer number (300855).

2^1002845 is an apocalyptic number.

It is an amenable number.

1002845 is a deficient number, since it is larger than the sum of its proper divisors (200575).

1002845 is an equidigital number, since it uses as much as digits as its factorization.

1002845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200574.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 1002845 is about 1001.4214896835. The cubic root of 1002845 is about 100.0947435416.

Adding to 1002845 its reverse (5482001), we get a palindrome (6484846).

The spelling of 1002845 in words is "one million, two thousand, eight hundred forty-five".