1816812 has 36 divisors (see below), whose sum is σ = 4644640. Its totient is φ = 598752.

The previous prime is 1816783. The next prime is 1816813. The reversal of 1816812 is 2186181.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (1816813) 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 11 ways as a sum of consecutive naturals, for example, 3693 + ... + 4155.

2^1816812 is an apocalyptic number.

1816812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1816812 is an abundant number, since it is smaller than the sum of its proper divisors (2827828).

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

1816812 is a wasteful number, since it uses less digits than its factorization.

1816812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 582 (or 577 counting only the distinct ones).

The product of its digits is 768, while the sum is 27.

The square root of 1816812 is about 1347.8916870431. The cubic root of 1816812 is about 122.0215853592.

It can be divided in two parts, 1816 and 812, that added together give a triangular number (2628 = T₇₂).

The spelling of 1816812 in words is "one million, eight hundred sixteen thousand, eight hundred twelve".