3520505 has 4 divisors (see below), whose sum is σ = 4224612. Its totient is φ = 2816400.

The previous prime is 3520499. The next prime is 3520507. The reversal of 3520505 is 5050253.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5050253 = 13 ⋅388481.

It can be written as a sum of positive squares in 2 ways, for example, as 1827904 + 1692601 = 1352^2 + 1301^2 .

It is a de Polignac number, because none of the positive numbers 2^k-3520505 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3520507) 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, 352046 + ... + 352055.

It is an arithmetic number, because the mean of its divisors is an integer number (1056153).

Almost surely, 2^3520505 is an apocalyptic number.

It is an amenable number.

3520505 is a deficient number, since it is larger than the sum of its proper divisors (704107).

3520505 is an equidigital number, since it uses as much as digits as its factorization.

3520505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 704106.

The product of its (nonzero) digits is 750, while the sum is 20.

The square root of 3520505 is about 1876.3008820549. The cubic root of 3520505 is about 152.1253726697.

Adding to 3520505 its reverse (5050253), we get a palindrome (8570758).

The spelling of 3520505 in words is "three million, five hundred twenty thousand, five hundred five".