720974393 has 2 divisors, whose sum is σ = 720974394. Its totient is φ = 720974392.

The previous prime is 720974377. The next prime is 720974411. The reversal of 720974393 is 393479027.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 443818489 + 277155904 = 21067^2 + 16648^2 .

It is an emirp because it is prime and its reverse (393479027) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 720974393 - 2⁴ = 720974377 is a prime.

It is not a weakly prime, because it can be changed into another prime (720974333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360487196 + 360487197.

It is an arithmetic number, because the mean of its divisors is an integer number (360487197).

Almost surely, 2^720974393 is an apocalyptic number.

It is an amenable number.

720974393 is a deficient number, since it is larger than the sum of its proper divisors (1).

720974393 is an equidigital number, since it uses as much as digits as its factorization.

720974393 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 285768, while the sum is 44.

The square root of 720974393 is about 26850.9663327039. The cubic root of 720974393 is about 896.6850864471.

The spelling of 720974393 in words is "seven hundred twenty million, nine hundred seventy-four thousand, three hundred ninety-three".