3601821 has 4 divisors (see below), whose sum is σ = 4802432. Its totient is φ = 2401212.

The previous prime is 3601783. The next prime is 3601837. The reversal of 3601821 is 1281063.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 3601821 - 2⁷ = 3601693 is a prime.

It is a super-2 number, since 2×3601821² = 25946229032082, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

3601821 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3601421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 600301 + ... + 600306.

It is an arithmetic number, because the mean of its divisors is an integer number (1200608).

Almost surely, 2^3601821 is an apocalyptic number.

It is an amenable number.

3601821 is a deficient number, since it is larger than the sum of its proper divisors (1200611).

3601821 is a wasteful number, since it uses less digits than its factorization.

3601821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1200610.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 3601821 is about 1897.8464110670. The cubic root of 3601821 is about 153.2877237797.

Adding to 3601821 its reverse (1281063), we get a palindrome (4882884).

The spelling of 3601821 in words is "three million, six hundred one thousand, eight hundred twenty-one".