840528197 has 4 divisors (see below), whose sum is σ = 840728460. Its totient is φ = 840327936.

The previous prime is 840528187. The next prime is 840528209. The reversal of 840528197 is 791825048.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 534488161 + 306040036 = 23119^2 + 17494^2 .

It is a cyclic number.

It is not a de Polignac number, because 840528197 - 2⁶ = 840528133 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 (840528107) 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 in 3 ways as a sum of consecutive naturals, for example, 93698 + ... + 102275.

It is an arithmetic number, because the mean of its divisors is an integer number (210182115).

Almost surely, 2^840528197 is an apocalyptic number.

It is an amenable number.

840528197 is a deficient number, since it is larger than the sum of its proper divisors (200263).

840528197 is a wasteful number, since it uses less digits than its factorization.

840528197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200262.

The product of its (nonzero) digits is 161280, while the sum is 44.

The square root of 840528197 is about 28991.8643243238. The cubic root of 840528197 is about 943.7365222291.

The spelling of 840528197 in words is "eight hundred forty million, five hundred twenty-eight thousand, one hundred ninety-seven".