3649649 has 4 divisors (see below), whose sum is σ = 3658740. Its totient is φ = 3640560.

The previous prime is 3649637. The next prime is 3649669. The reversal of 3649649 is 9469463.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9469463 = 283 ⋅33461.

It can be written as a sum of positive squares in 2 ways, for example, as 552049 + 3097600 = 743^2 + 1760^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3649649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3649609) 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, 3914 + ... + 4755.

It is an arithmetic number, because the mean of its divisors is an integer number (914685).

Almost surely, 2^3649649 is an apocalyptic number.

It is an amenable number.

3649649 is a deficient number, since it is larger than the sum of its proper divisors (9091).

3649649 is an equidigital number, since it uses as much as digits as its factorization.

3649649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9090.

The product of its digits is 139968, while the sum is 41.

The square root of 3649649 is about 1910.4054543473. The cubic root of 3649649 is about 153.9632368534.

The spelling of 3649649 in words is "three million, six hundred forty-nine thousand, six hundred forty-nine".