3645555 has 16 divisors (see below), whose sum is σ = 5958144. Its totient is φ = 1902560.

The previous prime is 3645539. The next prime is 3645557. The reversal of 3645555 is 5555463.

3645555 is nontrivially palindromic in base 9.

3645555 is an esthetic number in base 9, because in such base its adjacent digits differ by 1.

It is not a de Polignac number, because 3645555 - 2⁴ = 3645539 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a d-powerful number, because it can be written as 3¹³ + 6⁴ + 4⁸ + 5² + 5⁶ + 5⁶ + 5⁹ .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3645557) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1881 + ... + 3290.

It is an arithmetic number, because the mean of its divisors is an integer number (372384).

Almost surely, 2^3645555 is an apocalyptic number.

3645555 is a deficient number, since it is larger than the sum of its proper divisors (2312589).

3645555 is a wasteful number, since it uses less digits than its factorization.

3645555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5226.

The product of its digits is 45000, while the sum is 33.

The square root of 3645555 is about 1909.3336533985. Note that the first 3 decimals coincide. The cubic root of 3645555 is about 153.9056458057.

The spelling of 3645555 in words is "three million, six hundred forty-five thousand, five hundred fifty-five".