3812805 has 32 divisors (see below), whose sum is σ = 6904320. Its totient is φ = 1995840.

The previous prime is 3812801. The next prime is 3812807. The reversal of 3812805 is 5082183.

It is a happy number.

3812805 is a `hidden beast` number, since 381 + 280 + 5 = 666.

It is not a de Polignac number, because 3812805 - 2² = 3812801 is a prime.

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

3812805 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3812801) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8004 + ... + 8466.

It is an arithmetic number, because the mean of its divisors is an integer number (215760).

Almost surely, 2^3812805 is an apocalyptic number.

It is an amenable number.

3812805 is a deficient number, since it is larger than the sum of its proper divisors (3091515).

3812805 is a wasteful number, since it uses less digits than its factorization.

3812805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 538 (or 532 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 3812805 is about 1952.6405199114. The cubic root of 3812805 is about 156.2241599936.

Adding to 3812805 its reverse (5082183), we get a palindrome (8894988).

The spelling of 3812805 in words is "three million, eight hundred twelve thousand, eight hundred five".