856704897 has 32 divisors (see below), whose sum is σ = 1328006400. Its totient is φ = 544807296.

The previous prime is 856704847. The next prime is 856704899. The reversal of 856704897 is 798407658.

It is not a de Polignac number, because 856704897 - 2¹⁴ = 856688513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (856704899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 252303 + ... + 255675.

It is an arithmetic number, because the mean of its divisors is an integer number (41500200).

Almost surely, 2^856704897 is an apocalyptic number.

It is an amenable number.

856704897 is a deficient number, since it is larger than the sum of its proper divisors (471301503).

856704897 is a wasteful number, since it uses less digits than its factorization.

856704897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3814 (or 3808 counting only the distinct ones).

The product of its (nonzero) digits is 3386880, while the sum is 54.

The square root of 856704897 is about 29269.5216394119. The cubic root of 856704897 is about 949.7524366927.

The spelling of 856704897 in words is "eight hundred fifty-six million, seven hundred four thousand, eight hundred ninety-seven".