680239397 has 2 divisors, whose sum is σ = 680239398. Its totient is φ = 680239396.

The previous prime is 680239363. The next prime is 680239481. The reversal of 680239397 is 793932086.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 671794561 + 8444836 = 25919^2 + 2906^2 .

It is a cyclic number.

It is not a de Polignac number, because 680239397 - 2¹⁴ = 680223013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (680239097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340119698 + 340119699.

It is an arithmetic number, because the mean of its divisors is an integer number (340119699).

Almost surely, 2^680239397 is an apocalyptic number.

It is an amenable number.

680239397 is a deficient number, since it is larger than the sum of its proper divisors (1).

680239397 is an equidigital number, since it uses as much as digits as its factorization.

680239397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 489888, while the sum is 47.

The square root of 680239397 is about 26081.3994448151. The cubic root of 680239397 is about 879.4691172095.

The spelling of 680239397 in words is "six hundred eighty million, two hundred thirty-nine thousand, three hundred ninety-seven".