1812906 has 48 divisors (see below), whose sum is σ = 4268160. Its totient is φ = 554400.

The previous prime is 1812871. The next prime is 1812907. The reversal of 1812906 is 6092181.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1812906.

It is not an unprimeable number, because it can be changed into a prime (1812907) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11931 + ... + 12081.

It is an arithmetic number, because the mean of its divisors is an integer number (88920).

2^1812906 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1812906, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2134080).

1812906 is an abundant number, since it is smaller than the sum of its proper divisors (2455254).

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

1812906 is a wasteful number, since it uses less digits than its factorization.

1812906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211 (or 208 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 1812906 is about 1346.4419779552. The cubic root of 1812906 is about 121.9340770786.

Subtracting 1812906 from its reverse (6092181), we obtain a triangular number (4279275 = T₂₉₂₅).

The spelling of 1812906 in words is "one million, eight hundred twelve thousand, nine hundred six".