729271993 has 8 divisors (see below), whose sum is σ = 754085376. Its totient is φ = 704539200.

The previous prime is 729271969. The next prime is 729272009. The reversal of 729271993 is 399172927.

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 729271993 - 2⁹ = 729271481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (729271913) 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, 1453 + ... + 38218.

It is an arithmetic number, because the mean of its divisors is an integer number (94260672).

Almost surely, 2^729271993 is an apocalyptic number.

It is an amenable number.

729271993 is a deficient number, since it is larger than the sum of its proper divisors (24813383).

729271993 is a wasteful number, since it uses less digits than its factorization.

729271993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40295.

The product of its digits is 428652, while the sum is 49.

The square root of 729271993 is about 27005.0364376721. The cubic root of 729271993 is about 900.1119173579. Note that the first 3 decimals are identical.

The spelling of 729271993 in words is "seven hundred twenty-nine million, two hundred seventy-one thousand, nine hundred ninety-three".