3685709 has 4 divisors (see below), whose sum is σ = 3723804. Its totient is φ = 3647616.

The previous prime is 3685699. The next prime is 3685729. The reversal of 3685709 is 9075863.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9075863 = 19 ⋅477677.

It can be written as a sum of positive squares in 2 ways, for example, as 2788900 + 896809 = 1670^2 + 947^2 .

It is a cyclic number.

It is not a de Polignac number, because 3685709 - 2⁸ = 3685453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3685729) 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, 18902 + ... + 19095.

It is an arithmetic number, because the mean of its divisors is an integer number (930951).

Almost surely, 2^3685709 is an apocalyptic number.

It is an amenable number.

3685709 is a deficient number, since it is larger than the sum of its proper divisors (38095).

3685709 is an equidigital number, since it uses as much as digits as its factorization.

3685709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38094.

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 3685709 is about 1919.8200436499. The cubic root of 3685709 is about 154.4686488336.

The spelling of 3685709 in words is "three million, six hundred eighty-five thousand, seven hundred nine".