3649820 has 24 divisors (see below), whose sum is σ = 7853328. Its totient is φ = 1424000.

The previous prime is 3649777. The next prime is 3649831. The reversal of 3649820 is 289463.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1406 + ... + 3045.

It is an arithmetic number, because the mean of its divisors is an integer number (327222).

Almost surely, 2^3649820 is an apocalyptic number.

It is an amenable number.

3649820 is an abundant number, since it is smaller than the sum of its proper divisors (4203508).

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

3649820 is a wasteful number, since it uses less digits than its factorization.

3649820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4501 (or 4499 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 3649820 is about 1910.4502087204. The cubic root of 3649820 is about 153.9656414044.

The spelling of 3649820 in words is "three million, six hundred forty-nine thousand, eight hundred twenty".