840771457 has 2 divisors, whose sum is σ = 840771458. Its totient is φ = 840771456.

The previous prime is 840771443. The next prime is 840771469. The reversal of 840771457 is 754177048.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 703787841 + 136983616 = 26529^2 + 11704^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-840771457 is a prime.

It is not a weakly prime, because it can be changed into another prime (840771427) 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, 420385728 + 420385729.

It is an arithmetic number, because the mean of its divisors is an integer number (420385729).

Almost surely, 2^840771457 is an apocalyptic number.

It is an amenable number.

840771457 is a deficient number, since it is larger than the sum of its proper divisors (1).

840771457 is an equidigital number, since it uses as much as digits as its factorization.

840771457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 219520, while the sum is 43.

The square root of 840771457 is about 28996.0593357097. The cubic root of 840771457 is about 943.8275567331.

The spelling of 840771457 in words is "eight hundred forty million, seven hundred seventy-one thousand, four hundred fifty-seven".