724040321 has 8 divisors (see below), whose sum is σ = 751316544. Its totient is φ = 697238640.

The previous prime is 724040287. The next prime is 724040329. The reversal of 724040321 is 123040427.

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-724040321 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (724040329) 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, 115526 + ... + 121631.

It is an arithmetic number, because the mean of its divisors is an integer number (93914568).

Almost surely, 2^724040321 is an apocalyptic number.

724040321 is a gapful number since it is divisible by the number (71) formed by its first and last digit.

It is an amenable number.

724040321 is a deficient number, since it is larger than the sum of its proper divisors (27276223).

724040321 is a wasteful number, since it uses less digits than its factorization.

724040321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237271.

The product of its (nonzero) digits is 1344, while the sum is 23.

The square root of 724040321 is about 26907.9973427975. The cubic root of 724040321 is about 897.9543336351.

Adding to 724040321 its reverse (123040427), we get a palindrome (847080748).

The spelling of 724040321 in words is "seven hundred twenty-four million, forty thousand, three hundred twenty-one".