3705649 has 4 divisors (see below), whose sum is σ = 3833460. Its totient is φ = 3577840.

The previous prime is 3705629. The next prime is 3705659. The reversal of 3705649 is 9465073.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9465073 = 17 ⋅556769.

It can be written as a sum of positive squares in 2 ways, for example, as 1065024 + 2640625 = 1032^2 + 1625^2 .

It is a cyclic number.

It is not a de Polignac number, because 3705649 - 2⁵ = 3705617 is a prime.

It is a super-2 number, since 2×3705649² = 27463669022402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3705619) 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, 63862 + ... + 63919.

It is an arithmetic number, because the mean of its divisors is an integer number (958365).

Almost surely, 2^3705649 is an apocalyptic number.

It is an amenable number.

3705649 is a deficient number, since it is larger than the sum of its proper divisors (127811).

3705649 is a wasteful number, since it uses less digits than its factorization.

3705649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127810.

The product of its (nonzero) digits is 22680, while the sum is 34.

The square root of 3705649 is about 1925.0062337561. The cubic root of 3705649 is about 154.7467108427.

The spelling of 3705649 in words is "three million, seven hundred five thousand, six hundred forty-nine".