840197 has 2 divisors, whose sum is σ = 840198. Its totient is φ = 840196.

The previous prime is 840187. The next prime is 840223. The reversal of 840197 is 791048.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 519841 + 320356 = 721^2 + 566^2 .

It is a cyclic number.

It is not a de Polignac number, because 840197 - 2⁴ = 840181 is a prime.

It is a Chen prime.

It is a plaindrome in base 13.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (840137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420098 + 420099.

It is an arithmetic number, because the mean of its divisors is an integer number (420099).

2⁸⁴⁰¹⁹⁷ is an apocalyptic number.

It is an amenable number.

840197 is a deficient number, since it is larger than the sum of its proper divisors (1).

840197 is an equidigital number, since it uses as much as digits as its factorization.

840197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 840197 is about 916.6226050016. The cubic root of 840197 is about 94.3612551069.

The spelling of 840197 in words is "eight hundred forty thousand, one hundred ninety-seven".