3641621 has 4 divisors (see below), whose sum is σ = 3855852. Its totient is φ = 3427392.

The previous prime is 3641611. The next prime is 3641623. The reversal of 3641621 is 1261463.

It is a happy number.

3641621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1406596 + 2235025 = 1186^2 + 1495^2 .

It is a cyclic number.

It is not a de Polignac number, because 3641621 - 2¹⁰ = 3640597 is a prime.

It is a super-2 number, since 2×3641621² = 26522807015282, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3641623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107090 + ... + 107123.

It is an arithmetic number, because the mean of its divisors is an integer number (963963).

Almost surely, 2^3641621 is an apocalyptic number.

It is an amenable number.

3641621 is a deficient number, since it is larger than the sum of its proper divisors (214231).

3641621 is a wasteful number, since it uses less digits than its factorization.

3641621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214230.

The product of its digits is 864, while the sum is 23.

The square root of 3641621 is about 1908.3031729785. The cubic root of 3641621 is about 153.8502648709.

The spelling of 3641621 in words is "three million, six hundred forty-one thousand, six hundred twenty-one".