3909569 has 4 divisors (see below), whose sum is σ = 3938244. Its totient is φ = 3880896.

The previous prime is 3909559. The next prime is 3909589. The reversal of 3909569 is 9659093.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9659093 = 79 ⋅122267.

It can be written as a sum of positive squares in 2 ways, for example, as 1311025 + 2598544 = 1145^2 + 1612^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3909569 is a prime.

It is a super-2 number, since 2×3909569² = 30569459531522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3909509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14132 + ... + 14405.

It is an arithmetic number, because the mean of its divisors is an integer number (984561).

Almost surely, 2^3909569 is an apocalyptic number.

It is an amenable number.

3909569 is a deficient number, since it is larger than the sum of its proper divisors (28675).

3909569 is a wasteful number, since it uses less digits than its factorization.

3909569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28674.

The product of its (nonzero) digits is 65610, while the sum is 41.

The square root of 3909569 is about 1977.2630072906. The cubic root of 3909569 is about 157.5347231748.

The spelling of 3909569 in words is "three million, nine hundred nine thousand, five hundred sixty-nine".