840258157 has 2 divisors, whose sum is σ = 840258158. Its totient is φ = 840258156.

The previous prime is 840258143. The next prime is 840258161. The reversal of 840258157 is 751852048.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 618069321 + 222188836 = 24861^2 + 14906^2 .

It is a cyclic number.

It is not a de Polignac number, because 840258157 - 2¹⁵ = 840225389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (840258137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420129078 + 420129079.

It is an arithmetic number, because the mean of its divisors is an integer number (420129079).

Almost surely, 2^840258157 is an apocalyptic number.

It is an amenable number.

840258157 is a deficient number, since it is larger than the sum of its proper divisors (1).

840258157 is an equidigital number, since it uses as much as digits as its factorization.

840258157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 89600, while the sum is 40.

The square root of 840258157 is about 28987.2067816132. The cubic root of 840258157 is about 943.6354453474.

The spelling of 840258157 in words is "eight hundred forty million, two hundred fifty-eight thousand, one hundred fifty-seven".