1813816 has 16 divisors (see below), whose sum is σ = 3580200. Its totient is φ = 859104.

The previous prime is 1813813. The next prime is 1813817. The reversal of 1813816 is 6183181.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1813813) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5815 + ... + 6118.

2^1813816 is an apocalyptic number.

It is an amenable number.

1813816 is a deficient number, since it is larger than the sum of its proper divisors (1766384).

1813816 is a wasteful number, since it uses less digits than its factorization.

1813816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11958 (or 11954 counting only the distinct ones).

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

The square root of 1813816 is about 1346.7798632293. The cubic root of 1813816 is about 121.9544755345.

Adding to 1813816 its reverse (6183181), we get a palindrome (7996997).

The spelling of 1813816 in words is "one million, eight hundred thirteen thousand, eight hundred sixteen".