840358157 has 2 divisors, whose sum is σ = 840358158. Its totient is φ = 840358156.

The previous prime is 840358133. The next prime is 840358193. The reversal of 840358157 is 751853048.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 770284516 + 70073641 = 27754^2 + 8371^2 .

It is a cyclic number.

It is not a de Polignac number, because 840358157 - 2²⁶ = 773249293 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (840358117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420179078 + 420179079.

It is an arithmetic number, because the mean of its divisors is an integer number (420179079).

Almost surely, 2^840358157 is an apocalyptic number.

It is an amenable number.

840358157 is a deficient number, since it is larger than the sum of its proper divisors (1).

840358157 is an equidigital number, since it uses as much as digits as its factorization.

840358157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 134400, while the sum is 41.

The square root of 840358157 is about 28988.9316291581. The cubic root of 840358157 is about 943.6728782088.

The spelling of 840358157 in words is "eight hundred forty million, three hundred fifty-eight thousand, one hundred fifty-seven".