6839720945 has 8 divisors (see below), whose sum is σ = 8211807744. Its totient is φ = 5469015024.

The previous prime is 6839720941. The next prime is 6839720969. The reversal of 6839720945 is 5490279386.

It is a happy number.

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 6839720945 - 2² = 6839720941 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6839720941) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 334289 + ... + 354158.

It is an arithmetic number, because the mean of its divisors is an integer number (1026475968).

Almost surely, 2^6839720945 is an apocalyptic number.

It is an amenable number.

6839720945 is a deficient number, since it is larger than the sum of its proper divisors (1372086799).

6839720945 is a wasteful number, since it uses less digits than its factorization.

6839720945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 690439.

The product of its (nonzero) digits is 3265920, while the sum is 53.

The square root of 6839720945 is about 82702.6054305425. The cubic root of 6839720945 is about 1898.2181767091.

The spelling of 6839720945 in words is "six billion, eight hundred thirty-nine million, seven hundred twenty thousand, nine hundred forty-five".