2840321 has 4 divisors (see below), whose sum is σ = 3098544. Its totient is φ = 2582100.

The previous prime is 2840303. The next prime is 2840353. The reversal of 2840321 is 1230482.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2840321 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2840293 and 2840302.

It is not an unprimeable number, because it can be changed into a prime (2849321) 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, 129095 + ... + 129116.

It is an arithmetic number, because the mean of its divisors is an integer number (774636).

2^2840321 is an apocalyptic number.

It is an amenable number.

2840321 is a deficient number, since it is larger than the sum of its proper divisors (258223).

2840321 is a wasteful number, since it uses less digits than its factorization.

2840321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258222.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 2840321 is about 1685.3251911723. The cubic root of 2840321 is about 141.6193102768.

The spelling of 2840321 in words is "two million, eight hundred forty thousand, three hundred twenty-one".