3644840 has 16 divisors (see below), whose sum is σ = 8200980. Its totient is φ = 1457920.

The previous prime is 3644831. The next prime is 3644873. The reversal of 3644840 is 484463.

It can be written as a sum of positive squares in 2 ways, for example, as 3602404 + 42436 = 1898^2 + 206^2 .

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 3 ways as a sum of consecutive naturals, for example, 45521 + ... + 45600.

Almost surely, 2^3644840 is an apocalyptic number.

It is an amenable number.

3644840 is an abundant number, since it is smaller than the sum of its proper divisors (4556140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3644840 is a wasteful number, since it uses less digits than its factorization.

3644840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91132 (or 91128 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 29.

The square root of 3644840 is about 1909.1464061198. The cubic root of 3644840 is about 153.8955833478.

The spelling of 3644840 in words is "three million, six hundred forty-four thousand, eight hundred forty".