4000855 has 4 divisors (see below), whose sum is σ = 4801032. Its totient is φ = 3200680.

The previous prime is 4000853. The next prime is 4000861. The reversal of 4000855 is 5580004.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 4000855 - 2¹ = 4000853 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4000853) 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, 400081 + ... + 400090.

It is an arithmetic number, because the mean of its divisors is an integer number (1200258).

Almost surely, 2^4000855 is an apocalyptic number.

4000855 is a deficient number, since it is larger than the sum of its proper divisors (800177).

4000855 is an equidigital number, since it uses as much as digits as its factorization.

4000855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 800176.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 4000855 is about 2000.2137385790. The cubic root of 4000855 is about 158.7514146236.

Adding to 4000855 its reverse (5580004), we get a palindrome (9580859).

The spelling of 4000855 in words is "four million, eight hundred fifty-five", and thus it is an aban number.