3505609 has 8 divisors (see below), whose sum is σ = 3604680. Its totient is φ = 3408000.

The previous prime is 3505597. The next prime is 3505613. The reversal of 3505609 is 9065053.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 138384 + 3367225 = 372^2 + 1835^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3505609 - 2⁵ = 3505577 is a prime.

It is a Duffinian number.

3505609 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (3505699) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5877 + ... + 6445.

It is an arithmetic number, because the mean of its divisors is an integer number (450585).

Almost surely, 2^3505609 is an apocalyptic number.

It is an amenable number.

3505609 is a deficient number, since it is larger than the sum of its proper divisors (99071).

3505609 is a wasteful number, since it uses less digits than its factorization.

3505609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 731.

The product of its (nonzero) digits is 4050, while the sum is 28.

The square root of 3505609 is about 1872.3271615826. The cubic root of 3505609 is about 151.9105111518.

It can be divided in two parts, 3505 and 609, that added together give a palindrome (4114).

The spelling of 3505609 in words is "three million, five hundred five thousand, six hundred nine".