839493721 has 8 divisors (see below), whose sum is σ = 955629504. Its totient is φ = 729994320.

The previous prime is 839493709. The next prime is 839493731. The reversal of 839493721 is 127394938.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 839493721 - 2⁹ = 839493209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (839493731) 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, 1658826 + ... + 1659331.

It is an arithmetic number, because the mean of its divisors is an integer number (119453688).

Almost surely, 2^839493721 is an apocalyptic number.

It is an amenable number.

839493721 is a deficient number, since it is larger than the sum of its proper divisors (116135783).

839493721 is a wasteful number, since it uses less digits than its factorization.

839493721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3318191.

The product of its digits is 326592, while the sum is 46.

The square root of 839493721 is about 28974.0180334037. The cubic root of 839493721 is about 943.3491969042.

The spelling of 839493721 in words is "eight hundred thirty-nine million, four hundred ninety-three thousand, seven hundred twenty-one".