2718321 has 4 divisors (see below), whose sum is σ = 3624432. Its totient is φ = 1812212.

The previous prime is 2718319. The next prime is 2718329. The reversal of 2718321 is 1238172.

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 not a de Polignac number, because 2718321 - 2¹ = 2718319 is a prime.

It is a D-number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2718291 and 2718300.

It is not an unprimeable number, because it can be changed into a prime (2718329) 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, 453051 + ... + 453056.

It is an arithmetic number, because the mean of its divisors is an integer number (906108).

2^2718321 is an apocalyptic number.

It is an amenable number.

2718321 is a deficient number, since it is larger than the sum of its proper divisors (906111).

2718321 is an equidigital number, since it uses as much as digits as its factorization.

2718321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 906110.

The product of its digits is 672, while the sum is 24.

The square root of 2718321 is about 1648.7331500276. The cubic root of 2718321 is about 139.5619128834.

The spelling of 2718321 in words is "two million, seven hundred eighteen thousand, three hundred twenty-one".