856086421 has 8 divisors (see below), whose sum is σ = 884921600. Its totient is φ = 827327520.

The previous prime is 856086389. The next prime is 856086431. The reversal of 856086421 is 124680658.

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 856086421 - 2⁵ = 856086389 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 (856086431) 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, 4225 + ... + 41593.

It is an arithmetic number, because the mean of its divisors is an integer number (110615200).

Almost surely, 2^856086421 is an apocalyptic number.

It is an amenable number.

856086421 is a deficient number, since it is larger than the sum of its proper divisors (28835179).

856086421 is a wasteful number, since it uses less digits than its factorization.

856086421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38139.

The product of its (nonzero) digits is 92160, while the sum is 40.

The square root of 856086421 is about 29258.9545438657. The cubic root of 856086421 is about 949.5238319151.

It can be divided in two parts, 85608 and 6421, that added together give a palindrome (92029).

The spelling of 856086421 in words is "eight hundred fifty-six million, eighty-six thousand, four hundred twenty-one".