538871721 has 8 divisors (see below), whose sum is σ = 730673760. Its totient is φ = 353158752.

The previous prime is 538871717. The next prime is 538871741. The reversal of 538871721 is 127178835.

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

It is not a de Polignac number, because 538871721 - 2² = 538871717 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (538871701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1522060 + ... + 1522413.

It is an arithmetic number, because the mean of its divisors is an integer number (91334220).

Almost surely, 2^538871721 is an apocalyptic number.

It is an amenable number.

538871721 is a deficient number, since it is larger than the sum of its proper divisors (191802039).

538871721 is a wasteful number, since it uses less digits than its factorization.

538871721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3044535.

The product of its digits is 94080, while the sum is 42.

The square root of 538871721 is about 23213.6106842516. The cubic root of 538871721 is about 813.7577375910.

The spelling of 538871721 in words is "five hundred thirty-eight million, eight hundred seventy-one thousand, seven hundred twenty-one".