3656749 has 4 divisors (see below), whose sum is σ = 3745980. Its totient is φ = 3567520.

The previous prime is 3656707. The next prime is 3656753. The reversal of 3656749 is 9476563.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9476563 = 47 ⋅201629.

It can be written as a sum of positive squares in 2 ways, for example, as 260100 + 3396649 = 510^2 + 1843^2 .

It is a cyclic number.

It is not a de Polignac number, because 3656749 - 2⁷ = 3656621 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3656249) 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, 44554 + ... + 44635.

It is an arithmetic number, because the mean of its divisors is an integer number (936495).

Almost surely, 2^3656749 is an apocalyptic number.

It is an amenable number.

3656749 is a deficient number, since it is larger than the sum of its proper divisors (89231).

3656749 is an equidigital number, since it uses as much as digits as its factorization.

3656749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89230.

The product of its digits is 136080, while the sum is 40.

The square root of 3656749 is about 1912.2627957475. The cubic root of 3656749 is about 154.0630118258.

The spelling of 3656749 in words is "three million, six hundred fifty-six thousand, seven hundred forty-nine".