840219157 has 2 divisors, whose sum is σ = 840219158. Its totient is φ = 840219156.

The previous prime is 840219151. The next prime is 840219167. The reversal of 840219157 is 751912048.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 762091236 + 78127921 = 27606^2 + 8839^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-840219157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (840219151) 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, 420109578 + 420109579.

It is an arithmetic number, because the mean of its divisors is an integer number (420109579).

Almost surely, 2^840219157 is an apocalyptic number.

It is an amenable number.

840219157 is a deficient number, since it is larger than the sum of its proper divisors (1).

840219157 is an equidigital number, since it uses as much as digits as its factorization.

840219157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 37.

The square root of 840219157 is about 28986.5340632508. The cubic root of 840219157 is about 943.6208457265.

The spelling of 840219157 in words is "eight hundred forty million, two hundred nineteen thousand, one hundred fifty-seven".