3649749 has 4 divisors (see below), whose sum is σ = 4866336. Its totient is φ = 2433164.

The previous prime is 3649741. The next prime is 3649753. The reversal of 3649749 is 9479463.

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.

It is a cyclic number.

It is not a de Polignac number, because 3649749 - 2³ = 3649741 is a prime.

It is a D-number.

It is a Curzon number.

3649749 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 3649749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3649741) 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, 608289 + ... + 608294.

It is an arithmetic number, because the mean of its divisors is an integer number (1216584).

Almost surely, 2^3649749 is an apocalyptic number.

It is an amenable number.

3649749 is a deficient number, since it is larger than the sum of its proper divisors (1216587).

3649749 is a wasteful number, since it uses less digits than its factorization.

3649749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1216586.

The product of its digits is 163296, while the sum is 42.

The square root of 3649749 is about 1910.4316266226. The cubic root of 3649749 is about 153.9646430327.

The spelling of 3649749 in words is "three million, six hundred forty-nine thousand, seven hundred forty-nine".