724343021 has 8 divisors (see below), whose sum is σ = 776661120. Its totient is φ = 673103808.

The previous prime is 724343003. The next prime is 724343033. The reversal of 724343021 is 120343427.

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 724343021 - 2²² = 720148717 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 (724343051) 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, 268331 + ... + 271016.

It is an arithmetic number, because the mean of its divisors is an integer number (97082640).

Almost surely, 2^724343021 is an apocalyptic number.

It is an amenable number.

724343021 is a deficient number, since it is larger than the sum of its proper divisors (52318099).

724343021 is a wasteful number, since it uses less digits than its factorization.

724343021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 539443.

The product of its (nonzero) digits is 4032, while the sum is 26.

The square root of 724343021 is about 26913.6214768656. The cubic root of 724343021 is about 898.0794523147.

Adding to 724343021 its reverse (120343427), we get a palindrome (844686448).

The spelling of 724343021 in words is "seven hundred twenty-four million, three hundred forty-three thousand, twenty-one".