3645321 has 16 divisors (see below), whose sum is σ = 5283840. Its totient is φ = 2226960.

The previous prime is 3645307. The next prime is 3645347. The reversal of 3645321 is 1235463.

It is a happy number.

It is not a de Polignac number, because 3645321 - 2⁵ = 3645289 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 3645291 and 3645300.

It is not an unprimeable number, because it can be changed into a prime (3645371) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 736 + ... + 2798.

It is an arithmetic number, because the mean of its divisors is an integer number (330240).

Almost surely, 2^3645321 is an apocalyptic number.

3645321 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

3645321 is a deficient number, since it is larger than the sum of its proper divisors (1638519).

3645321 is a wasteful number, since it uses less digits than its factorization.

3645321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2116.

The product of its digits is 2160, while the sum is 24.

The square root of 3645321 is about 1909.2723744924. The cubic root of 3645321 is about 153.9023527825.

The spelling of 3645321 in words is "three million, six hundred forty-five thousand, three hundred twenty-one".