3649645 has 8 divisors (see below), whose sum is σ = 4637304. Its totient is φ = 2747904.

The previous prime is 3649637. The next prime is 3649669. The reversal of 3649645 is 5469463.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 32041 + 3617604 = 179^2 + 1902^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3649645 - 2³ = 3649637 is a prime.

It is a super-3 number, since 3×3649645³ (a number of 21 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 21384 + ... + 21553.

It is an arithmetic number, because the mean of its divisors is an integer number (579663).

Almost surely, 2^3649645 is an apocalyptic number.

It is an amenable number.

3649645 is a deficient number, since it is larger than the sum of its proper divisors (987659).

3649645 is a wasteful number, since it uses less digits than its factorization.

3649645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42959.

The product of its digits is 77760, while the sum is 37.

The square root of 3649645 is about 1910.4044074489. The cubic root of 3649645 is about 153.9631806057.

The spelling of 3649645 in words is "three million, six hundred forty-nine thousand, six hundred forty-five".