3649221 has 12 divisors (see below), whose sum is σ = 5383872. Its totient is φ = 2380776.

The previous prime is 3649207. The next prime is 3649229. The reversal of 3649221 is 1229463.

It is not a de Polignac number, because 3649221 - 2¹¹ = 3647173 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3649229) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3891 + ... + 4736.

It is an arithmetic number, because the mean of its divisors is an integer number (448656).

Almost surely, 2^3649221 is an apocalyptic number.

It is an amenable number.

3649221 is a deficient number, since it is larger than the sum of its proper divisors (1734651).

3649221 is a wasteful number, since it uses less digits than its factorization.

3649221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8680 (or 8677 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 3649221 is about 1910.2934329574. The cubic root of 3649221 is about 153.9572181155.

The spelling of 3649221 in words is "three million, six hundred forty-nine thousand, two hundred twenty-one".