2686321 has 9 divisors (see below), whose sum is σ = 2972683.
Its totient is φ = 2425720.
The previous prime is 2686319. The next prime is 2686337. The reversal of 2686321 is 1236862.
The square root of 2686321 is 1639.
It is a perfect power (a square), and thus also a powerful number.
It can be written as a sum of positive squares in only one way, i.e., 314721 + 2371600 = 561^2 + 1540^2
It is not a de Polignac number, because 2686321 - 21 = 2686319 is a prime.
It is a Duffinian number.
It is a self number, because there is not a number n which added to its sum of digits gives 2686321.
It is not an unprimeable number, because it can be changed into a prime (2686381) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 17955 + ... + 18103.
22686321 is an apocalyptic number.
2686321 is the 1639-th square number.
2686321 is the 820-th centered octagonal number.
It is an amenable number.
2686321 is a deficient number, since it is larger than the sum of its proper divisors (286362).
2686321 is an equidigital number, since it uses as much as digits as its factorization.
2686321 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 320 (or 160 counting only the distinct ones).
The product of its digits is 3456, while the sum is 28.
The cubic root of 2686321 is about 139.0121101193.
The spelling of 2686321 in words is "two million, six hundred eighty-six thousand, three hundred twenty-one".