3645943 has 12 divisors (see below), whose sum is σ = 4357992. Its totient is φ = 3039120.

The previous prime is 3645913. The next prime is 3645949. The reversal of 3645943 is 3495463.

It is a happy number.

It is not a de Polignac number, because 3645943 - 2¹⁷ = 3514871 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3645899 and 3645908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3645949) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 808 + ... + 2818.

It is an arithmetic number, because the mean of its divisors is an integer number (363166).

Almost surely, 2^3645943 is an apocalyptic number.

3645943 is a deficient number, since it is larger than the sum of its proper divisors (712049).

3645943 is a wasteful number, since it uses less digits than its factorization.

3645943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2062 (or 2055 counting only the distinct ones).

The product of its digits is 38880, while the sum is 34.

The square root of 3645943 is about 1909.4352568233. The cubic root of 3645943 is about 153.9111057217.

Subtracting from 3645943 its product of digits (38880), we obtain a palindrome (3607063).

The spelling of 3645943 in words is "three million, six hundred forty-five thousand, nine hundred forty-three".