2740321 has 4 divisors (see below), whose sum is σ = 2743812. Its totient is φ = 2736832.

The previous prime is 2740319. The next prime is 2740333. The reversal of 2740321 is 1230472.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1347921 + 1392400 = 1161^2 + 1180^2 .

It is a cyclic number.

It is not a de Polignac number, because 2740321 - 2¹ = 2740319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2740301) 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, 45 + ... + 2341.

It is an arithmetic number, because the mean of its divisors is an integer number (685953).

2^2740321 is an apocalyptic number.

It is an amenable number.

2740321 is a deficient number, since it is larger than the sum of its proper divisors (3491).

2740321 is a wasteful number, since it uses less digits than its factorization.

2740321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3490.

The product of its (nonzero) digits is 336, while the sum is 19.

The square root of 2740321 is about 1655.3914944810. The cubic root of 2740321 is about 139.9374039894.

Adding to 2740321 its reverse (1230472), we get a palindrome (3970793).

The spelling of 2740321 in words is "two million, seven hundred forty thousand, three hundred twenty-one".