720397 has 2 divisors, whose sum is σ = 720398. Its totient is φ = 720396.

The previous prime is 720373. The next prime is 720403. The reversal of 720397 is 793027.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 427716 + 292681 = 654^2 + 541^2 .

It is a cyclic number.

It is not a de Polignac number, because 720397 - 2¹¹ = 718349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (720367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360198 + 360199.

It is an arithmetic number, because the mean of its divisors is an integer number (360199).

2⁷²⁰³⁹⁷ is an apocalyptic number.

It is an amenable number.

720397 is a deficient number, since it is larger than the sum of its proper divisors (1).

720397 is an equidigital number, since it uses as much as digits as its factorization.

720397 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 720397 is about 848.7620396790. The cubic root of 720397 is about 89.6445652162.

The spelling of 720397 in words is "seven hundred twenty thousand, three hundred ninety-seven".