3648321 has 20 divisors (see below), whose sum is σ = 5533572. Its totient is φ = 2395008.

The previous prime is 3648317. The next prime is 3648343. The reversal of 3648321 is 1238463.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 876096 + 2772225 = 936^2 + 1665^2 .

It is not a de Polignac number, because 3648321 - 2² = 3648317 is a prime.

It is a super-2 number, since 2×3648321² = 26620492238082, which contains 22 as substring.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3648301) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 5605 + ... + 6221.

Almost surely, 2^3648321 is an apocalyptic number.

It is an amenable number.

3648321 is a deficient number, since it is larger than the sum of its proper divisors (1885251).

3648321 is an equidigital number, since it uses as much as digits as its factorization.

3648321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 702 (or 693 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 3648321 is about 1910.0578525270. The cubic root of 3648321 is about 153.9445603557.

It can be divided in two parts, 3648 and 321, that added together give a square (3969 = 63²).

The spelling of 3648321 in words is "three million, six hundred forty-eight thousand, three hundred twenty-one".