7984349721 has 12 divisors (see below), whose sum is σ = 11533993380. Its totient is φ = 5322418080.

The previous prime is 7984349713. The next prime is 7984349729. The reversal of 7984349721 is 1279434897.

7984349721 is a `hidden beast` number, since 7 + 98 + 43 + 497 + 21 = 666.

It is an interprime number because it is at equal distance from previous prime (7984349713) and next prime (7984349729).

It can be written as a sum of positive squares in 2 ways, for example, as 6183620496 + 1800729225 = 78636^2 + 42435^2 .

It is not a de Polignac number, because 7984349721 - 2³ = 7984349713 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (7984349729) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 85531 + ... + 152591.

It is an arithmetic number, because the mean of its divisors is an integer number (961166115).

Almost surely, 2^7984349721 is an apocalyptic number.

It is an amenable number.

7984349721 is a deficient number, since it is larger than the sum of its proper divisors (3549643659).

7984349721 is a wasteful number, since it uses less digits than its factorization.

7984349721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80296 (or 80293 counting only the distinct ones).

The product of its digits is 3048192, while the sum is 54.

The square root of 7984349721 is about 89355.1885510853. The cubic root of 7984349721 is about 1998.6949587022.

The spelling of 7984349721 in words is "seven billion, nine hundred eighty-four million, three hundred forty-nine thousand, seven hundred twenty-one".