856670407 has 4 divisors (see below), whose sum is σ = 859125400. Its totient is φ = 854215416.

The previous prime is 856670393. The next prime is 856670413. The reversal of 856670407 is 704076658.

856670407 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 is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-856670407 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856670417) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1226973 + ... + 1227670.

It is an arithmetic number, because the mean of its divisors is an integer number (214781350).

Almost surely, 2^856670407 is an apocalyptic number.

856670407 is a deficient number, since it is larger than the sum of its proper divisors (2454993).

856670407 is a wasteful number, since it uses less digits than its factorization.

856670407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2454992.

The product of its (nonzero) digits is 282240, while the sum is 43.

The square root of 856670407 is about 29268.9324540544. The cubic root of 856670407 is about 949.7396911910.

The spelling of 856670407 in words is "eight hundred fifty-six million, six hundred seventy thousand, four hundred seven".