721486539 has 12 divisors (see below), whose sum is σ = 1055340000. Its totient is φ = 474902064.

The previous prime is 721486523. The next prime is 721486541. The reversal of 721486539 is 935684127.

721486539 is a `hidden beast` number, since 72 + 1 + 48 + 6 + 539 = 666.

It is not a de Polignac number, because 721486539 - 2⁴ = 721486523 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 721486494 and 721486503.

It is not an unprimeable number, because it can be changed into a prime (721486739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 506664 + ... + 508085.

It is an arithmetic number, because the mean of its divisors is an integer number (87945000).

Almost surely, 2^721486539 is an apocalyptic number.

721486539 is a gapful number since it is divisible by the number (79) formed by its first and last digit.

721486539 is a deficient number, since it is larger than the sum of its proper divisors (333853461).

721486539 is a wasteful number, since it uses less digits than its factorization.

721486539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1014834 (or 1014831 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 721486539 is about 26860.5014659071. The cubic root of 721486539 is about 896.8973570392.

It can be divided in two parts, 72148 and 6539, that added together give a palindrome (78687).

The spelling of 721486539 in words is "seven hundred twenty-one million, four hundred eighty-six thousand, five hundred thirty-nine".