840757 has 2 divisors, whose sum is σ = 840758. Its totient is φ = 840756.

The previous prime is 840743. The next prime is 840761. The reversal of 840757 is 757048.

It is a happy number.

840757 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 463761 + 376996 = 681^2 + 614^2 .

It is a cyclic number.

It is not a de Polignac number, because 840757 - 2¹⁹ = 316469 is a prime.

It is a Chen prime.

840757 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (840727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420378 + 420379.

It is an arithmetic number, because the mean of its divisors is an integer number (420379).

2⁸⁴⁰⁷⁵⁷ is an apocalyptic number.

It is an amenable number.

840757 is a deficient number, since it is larger than the sum of its proper divisors (1).

840757 is an equidigital number, since it uses as much as digits as its factorization.

840757 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7840, while the sum is 31.

The square root of 840757 is about 916.9280233475. The cubic root of 840757 is about 94.3822147022.

It can be divided in two parts, 8407 and 57, that added together give a square (8464 = 92²).

The spelling of 840757 in words is "eight hundred forty thousand, seven hundred fifty-seven".