3556643 has 4 divisors (see below), whose sum is σ = 3561168. Its totient is φ = 3552120.

The previous prime is 3556607. The next prime is 3556649. The reversal of 3556643 is 3466553.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 3466553 = 499 ⋅6947.

It is a cyclic number.

It is not a de Polignac number, because 3556643 - 2⁸ = 3556387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3556649) 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, 743 + ... + 2768.

It is an arithmetic number, because the mean of its divisors is an integer number (890292).

Almost surely, 2^3556643 is an apocalyptic number.

3556643 is a deficient number, since it is larger than the sum of its proper divisors (4525).

3556643 is a wasteful number, since it uses less digits than its factorization.

3556643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4524.

The product of its digits is 32400, while the sum is 32.

The square root of 3556643 is about 1885.9064133726. The cubic root of 3556643 is about 152.6441242520.

The spelling of 3556643 in words is "three million, five hundred fifty-six thousand, six hundred forty-three".