493686721 has 8 divisors (see below), whose sum is σ = 545385600. Its totient is φ = 443124240.

The previous prime is 493686703. The next prime is 493686737. The reversal of 493686721 is 127686394.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-493686721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (493686821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 283186 + ... + 284923.

It is an arithmetic number, because the mean of its divisors is an integer number (68173200).

Almost surely, 2^493686721 is an apocalyptic number.

It is an amenable number.

493686721 is a deficient number, since it is larger than the sum of its proper divisors (51698879).

493686721 is a wasteful number, since it uses less digits than its factorization.

493686721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 568199.

The product of its digits is 435456, while the sum is 46.

The square root of 493686721 is about 22219.0621089190. The cubic root of 493686721 is about 790.3457979827.

The spelling of 493686721 in words is "four hundred ninety-three million, six hundred eighty-six thousand, seven hundred twenty-one".