6840291 has 4 divisors (see below), whose sum is σ = 9120392. Its totient is φ = 4560192.

The previous prime is 6840289. The next prime is 6840293. The reversal of 6840291 is 1920486.

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

It is an interprime number because it is at equal distance from previous prime (6840289) and next prime (6840293).

It is not a de Polignac number, because 6840291 - 2¹ = 6840289 is a prime.

It is a D-number.

It is a Duffinian number.

6840291 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6840293) 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, 1140046 + ... + 1140051.

It is an arithmetic number, because the mean of its divisors is an integer number (2280098).

Almost surely, 2^6840291 is an apocalyptic number.

6840291 is a deficient number, since it is larger than the sum of its proper divisors (2280101).

6840291 is a wasteful number, since it uses less digits than its factorization.

6840291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2280100.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 6840291 is about 2615.3949988482. The cubic root of 6840291 is about 189.8270910766.

The spelling of 6840291 in words is "six million, eight hundred forty thousand, two hundred ninety-one".