3643812 has 24 divisors (see below), whose sum is σ = 9447200. Its totient is φ = 1214568.

The previous prime is 3643811. The next prime is 3643819. The reversal of 3643812 is 2183463.

It is a happy number.

3643812 is a `hidden beast` number, since 3 + 643 + 8 + 12 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (3643811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16762 + ... + 16977.

Almost surely, 2^3643812 is an apocalyptic number.

It is an amenable number.

3643812 is an abundant number, since it is smaller than the sum of its proper divisors (5803388).

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

3643812 is a wasteful number, since it uses less digits than its factorization.

3643812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33752 (or 33744 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 3643812 is about 1908.8771568647. The cubic root of 3643812 is about 153.8811136193.

The spelling of 3643812 in words is "three million, six hundred forty-three thousand, eight hundred twelve".