3563921 has 4 divisors (see below), whose sum is σ = 3577344. Its totient is φ = 3550500.

The previous prime is 3563909. The next prime is 3563929. The reversal of 3563921 is 1293653.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1293653 = 19 ⋅68087.

It is a cyclic number.

It is not a de Polignac number, because 3563921 - 2¹⁸ = 3301777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3563929) 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, 6305 + ... + 6846.

It is an arithmetic number, because the mean of its divisors is an integer number (894336).

Almost surely, 2^3563921 is an apocalyptic number.

It is an amenable number.

3563921 is a deficient number, since it is larger than the sum of its proper divisors (13423).

3563921 is a wasteful number, since it uses less digits than its factorization.

3563921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13422.

The product of its digits is 4860, while the sum is 29.

The square root of 3563921 is about 1887.8350033835. The cubic root of 3563921 is about 152.7481724624.

The spelling of 3563921 in words is "three million, five hundred sixty-three thousand, nine hundred twenty-one".