493935721 has 4 divisors (see below), whose sum is σ = 494036100. Its totient is φ = 493835344.

The previous prime is 493935719. The next prime is 493935749. The reversal of 493935721 is 127539394.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 251666496 + 242269225 = 15864^2 + 15565^2 .

It is a cyclic number.

It is not a de Polignac number, because 493935721 - 2¹ = 493935719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (493935751) 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, 42406 + ... + 52783.

It is an arithmetic number, because the mean of its divisors is an integer number (123509025).

Almost surely, 2^493935721 is an apocalyptic number.

It is an amenable number.

493935721 is a deficient number, since it is larger than the sum of its proper divisors (100379).

493935721 is an equidigital number, since it uses as much as digits as its factorization.

493935721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100378.

The product of its digits is 204120, while the sum is 43.

The square root of 493935721 is about 22224.6646993830. The cubic root of 493935721 is about 790.4786508079.

The spelling of 493935721 in words is "four hundred ninety-three million, nine hundred thirty-five thousand, seven hundred twenty-one".