2740405 has 8 divisors (see below), whose sum is σ = 3377592. Its totient is φ = 2132928.

The previous prime is 2740403. The next prime is 2740421. The reversal of 2740405 is 5040472.

2740405 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 508369 + 2232036 = 713^2 + 1494^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 2740405 - 2¹ = 2740403 is a prime.

It is a Duffinian number.

2740405 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2740403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7222 + ... + 7591.

It is an arithmetic number, because the mean of its divisors is an integer number (422199).

2^2740405 is an apocalyptic number.

It is an amenable number.

2740405 is a deficient number, since it is larger than the sum of its proper divisors (637187).

2740405 is a wasteful number, since it uses less digits than its factorization.

2740405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14855.

The product of its (nonzero) digits is 1120, while the sum is 22.

The square root of 2740405 is about 1655.4168659283. The cubic root of 2740405 is about 139.9388338245.

Adding to 2740405 its reverse (5040472), we get a palindrome (7780877).

The spelling of 2740405 in words is "two million, seven hundred forty thousand, four hundred five".