3540221 has 4 divisors (see below), whose sum is σ = 3544032. Its totient is φ = 3536412.

The previous prime is 3540203. The next prime is 3540223. The reversal of 3540221 is 1220453.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 3540221 - 2⁶ = 3540157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 3540221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3540223) 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, 506 + ... + 2708.

It is an arithmetic number, because the mean of its divisors is an integer number (886008).

Almost surely, 2^3540221 is an apocalyptic number.

It is an amenable number.

3540221 is a deficient number, since it is larger than the sum of its proper divisors (3811).

3540221 is a wasteful number, since it uses less digits than its factorization.

3540221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3810.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 3540221 is about 1881.5475013935. The cubic root of 3540221 is about 152.4088284210.

Adding to 3540221 its reverse (1220453), we get a palindrome (4760674).

The spelling of 3540221 in words is "three million, five hundred forty thousand, two hundred twenty-one".