840430197 has 6 divisors (see below), whose sum is σ = 1213954742. Its totient is φ = 560286792.

The previous prime is 840430187. The next prime is 840430231. The reversal of 840430197 is 791034048.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 672313041 + 168117156 = 25929^2 + 12966^2 .

It is not a de Polignac number, because 840430197 - 2¹⁵ = 840397429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840430117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 46690558 + ... + 46690575.

Almost surely, 2^840430197 is an apocalyptic number.

It is an amenable number.

840430197 is a deficient number, since it is larger than the sum of its proper divisors (373524545).

840430197 is a wasteful number, since it uses less digits than its factorization.

840430197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93381139 (or 93381136 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 840430197 is about 28990.1741457343. The cubic root of 840430197 is about 943.6998430020.

The spelling of 840430197 in words is "eight hundred forty million, four hundred thirty thousand, one hundred ninety-seven".