765405397 has 2 divisors, whose sum is σ = 765405398. Its totient is φ = 765405396.

The previous prime is 765405391. The next prime is 765405419. The reversal of 765405397 is 793504567.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 634737636 + 130667761 = 25194^2 + 11431^2 .

It is a cyclic number.

It is not a de Polignac number, because 765405397 - 2⁷ = 765405269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (765405391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 382702698 + 382702699.

It is an arithmetic number, because the mean of its divisors is an integer number (382702699).

Almost surely, 2^765405397 is an apocalyptic number.

It is an amenable number.

765405397 is a deficient number, since it is larger than the sum of its proper divisors (1).

765405397 is an equidigital number, since it uses as much as digits as its factorization.

765405397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 793800, while the sum is 46.

The square root of 765405397 is about 27665.9609809600. The cubic root of 765405397 is about 914.7389530725.

The spelling of 765405397 in words is "seven hundred sixty-five million, four hundred five thousand, three hundred ninety-seven".