2730391 has 4 divisors (see below), whose sum is σ = 2737800. Its totient is φ = 2722984.

The previous prime is 2730383. The next prime is 2730397. The reversal of 2730391 is 1930372.

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

It is a cyclic number.

It is not a de Polignac number, because 2730391 - 2³ = 2730383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2730397) 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, 3121 + ... + 3898.

It is an arithmetic number, because the mean of its divisors is an integer number (684450).

2^2730391 is an apocalyptic number.

2730391 is a deficient number, since it is larger than the sum of its proper divisors (7409).

2730391 is an equidigital number, since it uses as much as digits as its factorization.

2730391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7408.

The product of its (nonzero) digits is 1134, while the sum is 25.

The square root of 2730391 is about 1652.3894819322. The cubic root of 2730391 is about 139.7681707422.

The spelling of 2730391 in words is "two million, seven hundred thirty thousand, three hundred ninety-one".