1812636 has 36 divisors (see below), whose sum is σ = 5237232. Its totient is φ = 517824.

The previous prime is 1812623. The next prime is 1812661. The reversal of 1812636 is 6362181.

1812636 is a `hidden beast` number, since 18 + 12 + 636 = 666.

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

It is a congruent number.

It is an unprimeable number.

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 in 11 ways as a sum of consecutive naturals, for example, 3345 + ... + 3848.

2^1812636 is an apocalyptic number.

It is an amenable number.

1812636 is an abundant number, since it is smaller than the sum of its proper divisors (3424596).

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

1812636 is a wasteful number, since it uses less digits than its factorization.

1812636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7210 (or 7205 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 1812636 is about 1346.3417099682. The cubic root of 1812636 is about 121.9280234763.

The spelling of 1812636 in words is "one million, eight hundred twelve thousand, six hundred thirty-six".