3661709 has 4 divisors (see below), whose sum is σ = 3666816. Its totient is φ = 3656604.

The previous prime is 3661703. The next prime is 3661733. The reversal of 3661709 is 9071663.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9071663 = 59 ⋅153757.

It is a cyclic number.

It is not a de Polignac number, because 3661709 - 2¹² = 3657613 is a prime.

It is a super-2 number, since 2×3661709² = 26816225601362, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3661703) 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, 1259 + ... + 2984.

It is an arithmetic number, because the mean of its divisors is an integer number (916704).

Almost surely, 2^3661709 is an apocalyptic number.

It is an amenable number.

3661709 is a deficient number, since it is larger than the sum of its proper divisors (5107).

3661709 is an equidigital number, since it uses as much as digits as its factorization.

3661709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5106.

The product of its (nonzero) digits is 6804, while the sum is 32.

The square root of 3661709 is about 1913.5592491480. The cubic root of 3661709 is about 154.1326371771.

The spelling of 3661709 in words is "three million, six hundred sixty-one thousand, seven hundred nine".