1800836 has 6 divisors (see below), whose sum is σ = 3151470. Its totient is φ = 900416.

The previous prime is 1800833. The next prime is 1800853. The reversal of 1800836 is 6380081.

It can be written as a sum of positive squares in only one way, i.e., 1223236 + 577600 = 1106^2 + 760^2 .

It is an Ulam number.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (1800833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 225101 + ... + 225108.

It is an arithmetic number, because the mean of its divisors is an integer number (525245).

2^1800836 is an apocalyptic number.

It is an amenable number.

1800836 is a deficient number, since it is larger than the sum of its proper divisors (1350634).

1800836 is a wasteful number, since it uses less digits than its factorization.

1800836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 450213 (or 450211 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 1800836 is about 1341.9523091377. The cubic root of 1800836 is about 121.6628692962.

The spelling of 1800836 in words is "one million, eight hundred thousand, eight hundred thirty-six".