720502397 has 2 divisors, whose sum is σ = 720502398. Its totient is φ = 720502396.

The previous prime is 720502319. The next prime is 720502399. The reversal of 720502397 is 793205027.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 719366041 + 1136356 = 26821^2 + 1066^2 .

It is a cyclic number.

It is not a de Polignac number, because 720502397 - 2²² = 716308093 is a prime.

Together with 720502399, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (720502399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360251198 + 360251199.

It is an arithmetic number, because the mean of its divisors is an integer number (360251199).

Almost surely, 2^720502397 is an apocalyptic number.

It is an amenable number.

720502397 is a deficient number, since it is larger than the sum of its proper divisors (1).

720502397 is an equidigital number, since it uses as much as digits as its factorization.

720502397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26460, while the sum is 35.

The square root of 720502397 is about 26842.1757128590. The cubic root of 720502397 is about 896.4893679075.

It can be divided in two parts, 72050 and 2397, that added together give a palindrome (74447).

The spelling of 720502397 in words is "seven hundred twenty million, five hundred two thousand, three hundred ninety-seven".