1808897 has 4 divisors (see below), whose sum is σ = 1812036. Its totient is φ = 1805760.

The previous prime is 1808887. The next prime is 1808921. The reversal of 1808897 is 7988081.

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

It can be written as a sum of positive squares in 2 ways, for example, as 231361 + 1577536 = 481^2 + 1256^2 .

It is a cyclic number.

It is not a de Polignac number, because 1808897 - 2¹² = 1804801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1808887) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 428 + ... + 1949.

It is an arithmetic number, because the mean of its divisors is an integer number (453009).

2^1808897 is an apocalyptic number.

It is an amenable number.

1808897 is a deficient number, since it is larger than the sum of its proper divisors (3139).

1808897 is an equidigital number, since it uses as much as digits as its factorization.

1808897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3138.

The product of its (nonzero) digits is 32256, while the sum is 41.

The square root of 1808897 is about 1344.9524155151. The cubic root of 1808897 is about 121.8441304241.

The spelling of 1808897 in words is "one million, eight hundred eight thousand, eight hundred ninety-seven".