1800906 has 8 divisors (see below), whose sum is σ = 3601824. Its totient is φ = 600300.

The previous prime is 1800889. The next prime is 1800907. The reversal of 1800906 is 6090081.

It is a sphenic number, since it is the product of 3 distinct primes.

1800906 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (1800907) 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 3 ways as a sum of consecutive naturals, for example, 150070 + ... + 150081.

It is an arithmetic number, because the mean of its divisors is an integer number (450228).

2^1800906 is an apocalyptic number.

1800906 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1800906 is a wasteful number, since it uses less digits than its factorization.

1800906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300156.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 1800906 is about 1341.9783902880. The cubic root of 1800906 is about 121.6644456549.

Adding to 1800906 its reverse (6090081), we get a palindrome (7890987).

The spelling of 1800906 in words is "one million, eight hundred thousand, nine hundred six".