3529721 has 4 divisors (see below), whose sum is σ = 3801252. Its totient is φ = 3258192.

The previous prime is 3529703. The next prime is 3529759. The reversal of 3529721 is 1279253.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 250000 + 3279721 = 500^2 + 1811^2 .

It is a cyclic number.

It is not a de Polignac number, because 3529721 - 2⁶ = 3529657 is a prime.

It is an Ulam number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3529621) 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, 135746 + ... + 135771.

It is an arithmetic number, because the mean of its divisors is an integer number (950313).

Almost surely, 2^3529721 is an apocalyptic number.

It is an amenable number.

3529721 is a deficient number, since it is larger than the sum of its proper divisors (271531).

3529721 is a wasteful number, since it uses less digits than its factorization.

3529721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271530.

The product of its digits is 3780, while the sum is 29.

The square root of 3529721 is about 1878.7551729802. The cubic root of 3529721 is about 152.2580019216.

The spelling of 3529721 in words is "three million, five hundred twenty-nine thousand, seven hundred twenty-one".