727145721 has 16 divisors (see below), whose sum is σ = 1085121600. Its totient is φ = 481222944.

The previous prime is 727145711. The next prime is 727145723. The reversal of 727145721 is 127541727.

727145721 is a `hidden beast` number, since 72 + 7 + 14 + 572 + 1 = 666.

It is not a de Polignac number, because 727145721 - 2⁷ = 727145593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (727145723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 94591 + ... + 101988.

It is an arithmetic number, because the mean of its divisors is an integer number (67820100).

Almost surely, 2^727145721 is an apocalyptic number.

It is an amenable number.

727145721 is a deficient number, since it is larger than the sum of its proper divisors (357975879).

727145721 is a wasteful number, since it uses less digits than its factorization.

727145721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196725 (or 196719 counting only the distinct ones).

The product of its digits is 27440, while the sum is 36.

The square root of 727145721 is about 26965.6396363965. The cubic root of 727145721 is about 899.2362743201.

The spelling of 727145721 in words is "seven hundred twenty-seven million, one hundred forty-five thousand, seven hundred twenty-one".