3649945 has 16 divisors (see below), whose sum is σ = 4756752. Its totient is φ = 2672640.

The previous prime is 3649931. The next prime is 3649949. The reversal of 3649945 is 5499463.

It can be written as a sum of positive squares in 8 ways, for example, as 304704 + 3345241 = 552^2 + 1829^2 .

It is not a de Polignac number, because 3649945 - 2⁵ = 3649913 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3649898 and 3649907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3649949) 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 15 ways as a sum of consecutive naturals, for example, 15025 + ... + 15265.

It is an arithmetic number, because the mean of its divisors is an integer number (297297).

Almost surely, 2^3649945 is an apocalyptic number.

It is an amenable number.

3649945 is a deficient number, since it is larger than the sum of its proper divisors (1106807).

3649945 is a wasteful number, since it uses less digits than its factorization.

3649945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 492.

The product of its digits is 116640, while the sum is 40.

The square root of 3649945 is about 1910.4829232422. The cubic root of 3649945 is about 153.9673990697.

The spelling of 3649945 in words is "three million, six hundred forty-nine thousand, nine hundred forty-five".