840741557 has 2 divisors, whose sum is σ = 840741558. Its totient is φ = 840741556.

The previous prime is 840741553. The next prime is 840741599. The reversal of 840741557 is 755147048.

840741557 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 693216241 + 147525316 = 26329^2 + 12146^2 .

It is a cyclic number.

It is not a de Polignac number, because 840741557 - 2² = 840741553 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (840741553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420370778 + 420370779.

It is an arithmetic number, because the mean of its divisors is an integer number (420370779).

Almost surely, 2^840741557 is an apocalyptic number.

It is an amenable number.

840741557 is a deficient number, since it is larger than the sum of its proper divisors (1).

840741557 is an equidigital number, since it uses as much as digits as its factorization.

840741557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 156800, while the sum is 41.

The square root of 840741557 is about 28995.5437438238. The cubic root of 840741557 is about 943.8163682870.

The spelling of 840741557 in words is "eight hundred forty million, seven hundred forty-one thousand, five hundred fifty-seven".