721693493 has 8 divisors (see below), whose sum is σ = 730010880. Its totient is φ = 713405440.

The previous prime is 721693393. The next prime is 721693559. The reversal of 721693493 is 394396127.

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

It is a cyclic number.

It is not a de Polignac number, because 721693493 - 2¹⁴ = 721677109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721693393) 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 7 ways as a sum of consecutive naturals, for example, 44213 + ... + 58293.

It is an arithmetic number, because the mean of its divisors is an integer number (91251360).

Almost surely, 2^721693493 is an apocalyptic number.

It is an amenable number.

721693493 is a deficient number, since it is larger than the sum of its proper divisors (8317387).

721693493 is a wasteful number, since it uses less digits than its factorization.

721693493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14667.

The product of its digits is 244944, while the sum is 44.

The square root of 721693493 is about 26864.3535749513. The cubic root of 721693493 is about 896.9831053476.

The spelling of 721693493 in words is "seven hundred twenty-one million, six hundred ninety-three thousand, four hundred ninety-three".