727627921 has 4 divisors (see below), whose sum is σ = 727683892. Its totient is φ = 727571952.

The previous prime is 727627919. The next prime is 727627963. The reversal of 727627921 is 129726727.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 588741696 + 138886225 = 24264^2 + 11785^2 .

It is a cyclic number.

It is not a de Polignac number, because 727627921 - 2¹ = 727627919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (727627321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2815 + ... + 38251.

It is an arithmetic number, because the mean of its divisors is an integer number (181920973).

Almost surely, 2^727627921 is an apocalyptic number.

It is an amenable number.

727627921 is a deficient number, since it is larger than the sum of its proper divisors (55971).

727627921 is a wasteful number, since it uses less digits than its factorization.

727627921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55970.

The product of its digits is 148176, while the sum is 43.

The square root of 727627921 is about 26974.5791626116. The cubic root of 727627921 is about 899.4350038208.

The spelling of 727627921 in words is "seven hundred twenty-seven million, six hundred twenty-seven thousand, nine hundred twenty-one".