3651749 has 4 divisors (see below), whose sum is σ = 3668064. Its totient is φ = 3635436.

The previous prime is 3651731. The next prime is 3651757. The reversal of 3651749 is 9471563.

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: 9471563 = 197 ⋅48079.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3651749 is a prime.

It is a d-powerful number, because it can be written as 3⁷ + 6⁸ + 5⁹ + 1 + 7⁵ + 4 + 9 .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3651449) 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, 7817 + ... + 8270.

It is an arithmetic number, because the mean of its divisors is an integer number (917016).

Almost surely, 2^3651749 is an apocalyptic number.

It is an amenable number.

3651749 is a deficient number, since it is larger than the sum of its proper divisors (16315).

3651749 is a wasteful number, since it uses less digits than its factorization.

3651749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16314.

The product of its digits is 22680, while the sum is 35.

The square root of 3651749 is about 1910.9549968537. The cubic root of 3651749 is about 153.9927612272.

The spelling of 3651749 in words is "three million, six hundred fifty-one thousand, seven hundred forty-nine".