856919705 has 4 divisors (see below), whose sum is σ = 1028303652. Its totient is φ = 685535760.

The previous prime is 856919699. The next prime is 856919729. The reversal of 856919705 is 507919658.

It is a happy number.

856919705 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 645769744 + 211149961 = 25412^2 + 14531^2 .

It is not a de Polignac number, because 856919705 - 2⁶ = 856919641 is a prime.

It is a super-2 number, since 2×856919705² = 1468622761634574050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85691966 + ... + 85691975.

It is an arithmetic number, because the mean of its divisors is an integer number (257075913).

Almost surely, 2^856919705 is an apocalyptic number.

It is an amenable number.

856919705 is a deficient number, since it is larger than the sum of its proper divisors (171383947).

856919705 is a wasteful number, since it uses less digits than its factorization.

856919705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171383946.

The product of its (nonzero) digits is 680400, while the sum is 50.

The square root of 856919705 is about 29273.1908920090. The cubic root of 856919705 is about 949.8318095601.

The spelling of 856919705 in words is "eight hundred fifty-six million, nine hundred nineteen thousand, seven hundred five".