486687721 has 9 divisors (see below), whose sum is σ = 527315781. Its totient is φ = 448985472.

The previous prime is 486687709. The next prime is 486687727. The reversal of 486687721 is 127786684.

It is a happy number.

The square root of 486687721 is 22061.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 19263321 + 467424400 = 4389^2 + 21620^2 .

It is not a de Polignac number, because 486687721 - 2²¹ = 484590569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (486687727) 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 8 ways as a sum of consecutive naturals, for example, 285945 + ... + 287641.

Almost surely, 2^486687721 is an apocalyptic number.

486687721 is the 22061-st square number.

486687721 is the 11031-st centered octagonal number.

It is an amenable number.

486687721 is a deficient number, since it is larger than the sum of its proper divisors (40628060).

486687721 is an frugal number, since it uses more digits than its factorization.

486687721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3420 (or 1710 counting only the distinct ones).

The product of its digits is 903168, while the sum is 49.

The cubic root of 486687721 is about 786.5930950978.

Multiplying 486687721 by its sum of digits (49), we get a square (23847698329 = 154427²).

The spelling of 486687721 in words is "four hundred eighty-six million, six hundred eighty-seven thousand, seven hundred twenty-one".