3643855 has 4 divisors (see below), whose sum is σ = 4372632. Its totient is φ = 2915080.

The previous prime is 3643853. The next prime is 3643859. The reversal of 3643855 is 5583463.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5583463 = 17 ⋅328439.

It is not a de Polignac number, because 3643855 - 2¹ = 3643853 is a prime.

It is a super-2 number, since 2×3643855² = 26555358522050, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 3643855.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3643853) 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, 364381 + ... + 364390.

It is an arithmetic number, because the mean of its divisors is an integer number (1093158).

Almost surely, 2^3643855 is an apocalyptic number.

3643855 is a deficient number, since it is larger than the sum of its proper divisors (728777).

3643855 is an equidigital number, since it uses as much as digits as its factorization.

3643855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 728776.

The product of its digits is 43200, while the sum is 34.

The square root of 3643855 is about 1908.8884199974. Note that the first 3 decimals coincide. The cubic root of 3643855 is about 153.8817189251.

The spelling of 3643855 in words is "three million, six hundred forty-three thousand, eight hundred fifty-five".