724357993 has 2 divisors, whose sum is σ = 724357994. Its totient is φ = 724357992.

The previous prime is 724357973. The next prime is 724358017. The reversal of 724357993 is 399753427.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 486334809 + 238023184 = 22053^2 + 15428^2 .

It is an emirp because it is prime and its reverse (399753427) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 724357993 - 2²¹ = 722260841 is a prime.

It is not a weakly prime, because it can be changed into another prime (724357973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 362178996 + 362178997.

It is an arithmetic number, because the mean of its divisors is an integer number (362178997).

Almost surely, 2^724357993 is an apocalyptic number.

It is an amenable number.

724357993 is a deficient number, since it is larger than the sum of its proper divisors (1).

724357993 is an equidigital number, since it uses as much as digits as its factorization.

724357993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1428840, while the sum is 49.

The square root of 724357993 is about 26913.8996245434. The cubic root of 724357993 is about 898.0856399691.

The spelling of 724357993 in words is "seven hundred twenty-four million, three hundred fifty-seven thousand, nine hundred ninety-three".