2740391 has 4 divisors (see below), whose sum is σ = 2751312. Its totient is φ = 2729472.

The previous prime is 2740379. The next prime is 2740393. The reversal of 2740391 is 1930472.

2740391 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2740391 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 2740391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2740393) 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 3 ways as a sum of consecutive naturals, for example, 5075 + ... + 5588.

It is an arithmetic number, because the mean of its divisors is an integer number (687828).

2^2740391 is an apocalyptic number.

2740391 is a deficient number, since it is larger than the sum of its proper divisors (10921).

2740391 is a wasteful number, since it uses less digits than its factorization.

2740391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10920.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 2740391 is about 1655.4126373808. The cubic root of 2740391 is about 139.9385955207.

The spelling of 2740391 in words is "two million, seven hundred forty thousand, three hundred ninety-one".