3521725 has 6 divisors (see below), whose sum is σ = 4366970. Its totient is φ = 2817360.

The previous prime is 3521723. The next prime is 3521729. The reversal of 3521725 is 5271253.

It can be written as a sum of positive squares in 3 ways, for example, as 736164 + 2785561 = 858^2 + 1669^2 .

It is not a de Polignac number, because 3521725 - 2¹ = 3521723 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 140869 = 3521725 / (3 + 5 + 2 + 1 + 7 + 2 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 3521725.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3521723) 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, 70410 + ... + 70459.

Almost surely, 2^3521725 is an apocalyptic number.

It is an amenable number.

3521725 is a deficient number, since it is larger than the sum of its proper divisors (845245).

3521725 is a wasteful number, since it uses less digits than its factorization.

3521725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140879 (or 140874 counting only the distinct ones).

The product of its digits is 2100, while the sum is 25.

The square root of 3521725 is about 1876.6259616663. The cubic root of 3521725 is about 152.1429432095.

Adding to 3521725 its reverse (5271253), we get a palindrome (8792978).

The spelling of 3521725 in words is "three million, five hundred twenty-one thousand, seven hundred twenty-five".