720000397 has 2 divisors, whose sum is σ = 720000398. Its totient is φ = 720000396.

The previous prime is 720000343. The next prime is 720000461. The reversal of 720000397 is 793000027.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 467381161 + 252619236 = 21619^2 + 15894^2 .

It is a cyclic number.

It is not a de Polignac number, because 720000397 - 2²⁷ = 585782669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (720010397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360000198 + 360000199.

It is an arithmetic number, because the mean of its divisors is an integer number (360000199).

Almost surely, 2^720000397 is an apocalyptic number.

It is an amenable number.

720000397 is a deficient number, since it is larger than the sum of its proper divisors (1).

720000397 is an equidigital number, since it uses as much as digits as its factorization.

720000397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2646, while the sum is 28.

The square root of 720000397 is about 26832.8231276547. The cubic root of 720000397 is about 896.2811140445.

The spelling of 720000397 in words is "seven hundred twenty million, three hundred ninety-seven", and thus it is an aban number.