3539221 has 6 divisors (see below), whose sum is σ = 4117110. Its totient is φ = 3033576.

The previous prime is 3539167. The next prime is 3539257. The reversal of 3539221 is 1229353.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 2436721 + 1102500 = 1561^2 + 1050^2 .

It is not a de Polignac number, because 3539221 - 2²¹ = 1442069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3539021) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36066 + ... + 36163.

It is an arithmetic number, because the mean of its divisors is an integer number (686185).

Almost surely, 2^3539221 is an apocalyptic number.

It is an amenable number.

3539221 is a deficient number, since it is larger than the sum of its proper divisors (577889).

3539221 is an equidigital number, since it uses as much as digits as its factorization.

3539221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72243 (or 72236 counting only the distinct ones).

The product of its digits is 1620, while the sum is 25.

The square root of 3539221 is about 1881.2817439182. The cubic root of 3539221 is about 152.3944768518.

The spelling of 3539221 in words is "three million, five hundred thirty-nine thousand, two hundred twenty-one".