1811836 has 12 divisors (see below), whose sum is σ = 3414712. Its totient is φ = 836208.

The previous prime is 1811827. The next prime is 1811837. The reversal of 1811836 is 6381181.

It is a happy number.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1811837) 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, 17370 + ... + 17473.

2^1811836 is an apocalyptic number.

It is an amenable number.

1811836 is a deficient number, since it is larger than the sum of its proper divisors (1602876).

1811836 is a wasteful number, since it uses less digits than its factorization.

1811836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34860 (or 34858 counting only the distinct ones).

The product of its digits is 1152, while the sum is 28.

The square root of 1811836 is about 1346.0445757849. The cubic root of 1811836 is about 121.9100833471.

The spelling of 1811836 in words is "one million, eight hundred eleven thousand, eight hundred thirty-six".