1801806 has 8 divisors (see below), whose sum is σ = 3603624. Its totient is φ = 600600.

The previous prime is 1801781. The next prime is 1801817. The reversal of 1801806 is 6081081.

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

1801806 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 150145 + ... + 150156.

It is an arithmetic number, because the mean of its divisors is an integer number (450453).

2^1801806 is an apocalyptic number.

1801806 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.

1801806 is a wasteful number, since it uses less digits than its factorization.

1801806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300306.

The product of its (nonzero) digits is 384, while the sum is 24.

The square root of 1801806 is about 1342.3136742207. The cubic root of 1801806 is about 121.6847094861.

Adding to 1801806 its reverse (6081081), we get a palindrome (7882887).

Subtracting 1801806 from its reverse (6081081), we obtain a triangular number (4279275 = T₂₉₂₅).

The spelling of 1801806 in words is "one million, eight hundred one thousand, eight hundred six".