3651709 has 4 divisors (see below), whose sum is σ = 3777660. Its totient is φ = 3525760.

The previous prime is 3651673. The next prime is 3651731. The reversal of 3651709 is 9071563.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 727609 + 2924100 = 853^2 + 1710^2 .

It is a cyclic number.

It is not a de Polignac number, because 3651709 - 2¹³ = 3643517 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3651409) 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, 62932 + ... + 62989.

It is an arithmetic number, because the mean of its divisors is an integer number (944415).

Almost surely, 2^3651709 is an apocalyptic number.

It is an amenable number.

3651709 is a deficient number, since it is larger than the sum of its proper divisors (125951).

3651709 is a wasteful number, since it uses less digits than its factorization.

3651709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125950.

The product of its (nonzero) digits is 5670, while the sum is 31.

The square root of 3651709 is about 1910.9445308538. The cubic root of 3651709 is about 153.9921989639.

The spelling of 3651709 in words is "three million, six hundred fifty-one thousand, seven hundred nine".