3649805 has 16 divisors (see below), whose sum is σ = 4667520. Its totient is φ = 2731968.

The previous prime is 3649777. The next prime is 3649831. The reversal of 3649805 is 5089463.

It is a cyclic number.

It is not a de Polignac number, because 3649805 - 2⁶ = 3649741 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9599 + ... + 9971.

It is an arithmetic number, because the mean of its divisors is an integer number (291720).

Almost surely, 2^3649805 is an apocalyptic number.

It is an amenable number.

3649805 is a deficient number, since it is larger than the sum of its proper divisors (1017715).

3649805 is a wasteful number, since it uses less digits than its factorization.

3649805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 3649805 is about 1910.4462829402. The cubic root of 3649805 is about 153.9654304819.

The spelling of 3649805 in words is "three million, six hundred forty-nine thousand, eight hundred five".