3688321 has 8 divisors (see below), whose sum is σ = 4539584. Its totient is φ = 2918160.

The previous prime is 3688313. The next prime is 3688331. The reversal of 3688321 is 1238863.

3688321 = T₂₃₈ + T₂₃₉ + ... + T₃₂₈.

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

It is not a de Polignac number, because 3688321 - 2³ = 3688313 is a prime.

It is the 1921-st Hogben number.

It is not an unprimeable number, because it can be changed into a prime (3688301) by changing a digit.

It is a nontrivial repunit in base 1920.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20175 + ... + 20356.

It is an arithmetic number, because the mean of its divisors is an integer number (567448).

Almost surely, 2^3688321 is an apocalyptic number.

It is an amenable number.

3688321 is a deficient number, since it is larger than the sum of its proper divisors (851263).

3688321 is a wasteful number, since it uses less digits than its factorization.

3688321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40551.

The product of its digits is 6912, while the sum is 31.

The square root of 3688321 is about 1920.5001952616. The cubic root of 3688321 is about 154.5051299952.

The spelling of 3688321 in words is "three million, six hundred eighty-eight thousand, three hundred twenty-one".