856153709 has 8 divisors (see below), whose sum is σ = 868464000. Its totient is φ = 843859296.

The previous prime is 856153703. The next prime is 856153717. The reversal of 856153709 is 907351658.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 856153709 - 2⁸ = 856153453 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 856153709.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856153703) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 142994 + ... + 148860.

It is an arithmetic number, because the mean of its divisors is an integer number (108558000).

Almost surely, 2^856153709 is an apocalyptic number.

It is an amenable number.

856153709 is a deficient number, since it is larger than the sum of its proper divisors (12310291).

856153709 is a wasteful number, since it uses less digits than its factorization.

856153709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7939.

The product of its (nonzero) digits is 226800, while the sum is 44.

The square root of 856153709 is about 29260.1043914748. The cubic root of 856153709 is about 949.5487086426.

The spelling of 856153709 in words is "eight hundred fifty-six million, one hundred fifty-three thousand, seven hundred nine".