3649621 has 8 divisors (see below), whose sum is σ = 3796920. Its totient is φ = 3503808.

The previous prime is 3649609. The next prime is 3649637. The reversal of 3649621 is 1269463.

It can be written as a sum of positive squares in 4 ways, for example, as 171396 + 3478225 = 414^2 + 1865^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3649621 - 2¹¹ = 3647573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3649601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8995 + ... + 9391.

It is an arithmetic number, because the mean of its divisors is an integer number (474615).

Almost surely, 2^3649621 is an apocalyptic number.

It is an amenable number.

3649621 is a deficient number, since it is larger than the sum of its proper divisors (147299).

3649621 is a wasteful number, since it uses less digits than its factorization.

3649621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 743.

The product of its digits is 7776, while the sum is 31.

The square root of 3649621 is about 1910.3981260460. The cubic root of 3649621 is about 153.9628431185.

The spelling of 3649621 in words is "three million, six hundred forty-nine thousand, six hundred twenty-one".