3811816 has 8 divisors (see below), whose sum is σ = 7147170. Its totient is φ = 1905904.

The previous prime is 3811783. The next prime is 3811817. The reversal of 3811816 is 6181183.

It is a happy number.

3811816 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 2709316 + 1102500 = 1646^2 + 1050^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (3811817) by changing a digit.

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 as a sum of consecutive naturals, namely, 238231 + ... + 238246.

Almost surely, 2^3811816 is an apocalyptic number.

It is an amenable number.

3811816 is a deficient number, since it is larger than the sum of its proper divisors (3335354).

3811816 is a wasteful number, since it uses less digits than its factorization.

3811816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 476483 (or 476479 counting only the distinct ones).

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

The square root of 3811816 is about 1952.3872566681. The cubic root of 3811816 is about 156.2106512115.

Adding to 3811816 its reverse (6181183), we get a palindrome (9992999).

It can be divided in two parts, 381 and 1816, that added together give a cube (2197 = 13³).

The spelling of 3811816 in words is "three million, eight hundred eleven thousand, eight hundred sixteen".