7905471721 has 8 divisors (see below), whose sum is σ = 9510342080. Its totient is φ = 6419480688.

The previous prime is 7905471713. The next prime is 7905471731. The reversal of 7905471721 is 1271745097.

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 7905471721 - 2³ = 7905471713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7905471731) 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, 29719686 + ... + 29719951.

It is an arithmetic number, because the mean of its divisors is an integer number (1188792760).

Almost surely, 2^7905471721 is an apocalyptic number.

It is an amenable number.

7905471721 is a deficient number, since it is larger than the sum of its proper divisors (1604870359).

7905471721 is a wasteful number, since it uses less digits than its factorization.

7905471721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59439663.

The product of its (nonzero) digits is 123480, while the sum is 43.

The square root of 7905471721 is about 88912.7196805946. The cubic root of 7905471721 is about 1992.0914117534.

The spelling of 7905471721 in words is "seven billion, nine hundred five million, four hundred seventy-one thousand, seven hundred twenty-one".