785680397 has 2 divisors, whose sum is σ = 785680398. Its totient is φ = 785680396.

The previous prime is 785680373. The next prime is 785680409. The reversal of 785680397 is 793086587.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 778465801 + 7214596 = 27901^2 + 2686^2 .

It is a cyclic number.

It is not a de Polignac number, because 785680397 - 2⁸ = 785680141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (785680297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 392840198 + 392840199.

It is an arithmetic number, because the mean of its divisors is an integer number (392840199).

Almost surely, 2^785680397 is an apocalyptic number.

It is an amenable number.

785680397 is a deficient number, since it is larger than the sum of its proper divisors (1).

785680397 is an equidigital number, since it uses as much as digits as its factorization.

785680397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2540160, while the sum is 53.

The square root of 785680397 is about 28029.9910274691. The cubic root of 785680397 is about 922.7455776937.

The spelling of 785680397 in words is "seven hundred eighty-five million, six hundred eighty thousand, three hundred ninety-seven".