6840005749 has 2 divisors, whose sum is σ = 6840005750. Its totient is φ = 6840005748.

The previous prime is 6840005693. The next prime is 6840005791. The reversal of 6840005749 is 9475000486.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4703902225 + 2136103524 = 68585^2 + 46218^2 .

It is a cyclic number.

It is not a de Polignac number, because 6840005749 - 2¹³ = 6839997557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6840002749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3420002874 + 3420002875.

It is an arithmetic number, because the mean of its divisors is an integer number (3420002875).

Almost surely, 2^6840005749 is an apocalyptic number.

It is an amenable number.

6840005749 is a deficient number, since it is larger than the sum of its proper divisors (1).

6840005749 is an equidigital number, since it uses as much as digits as its factorization.

6840005749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 241920, while the sum is 43.

The square root of 6840005749 is about 82704.3272688920. The cubic root of 6840005749 is about 1898.2445234286.

The spelling of 6840005749 in words is "six billion, eight hundred forty million, five thousand, seven hundred forty-nine".