856904241 has 4 divisors (see below), whose sum is σ = 1142538992. Its totient is φ = 571269492.

The previous prime is 856904239. The next prime is 856904299. The reversal of 856904241 is 142409658.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 856904241 - 2¹ = 856904239 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 856904241.

It is not an unprimeable number, because it can be changed into a prime (856900241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142817371 + ... + 142817376.

It is an arithmetic number, because the mean of its divisors is an integer number (285634748).

Almost surely, 2^856904241 is an apocalyptic number.

It is an amenable number.

856904241 is a deficient number, since it is larger than the sum of its proper divisors (285634751).

856904241 is a wasteful number, since it uses less digits than its factorization.

856904241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285634750.

The product of its (nonzero) digits is 69120, while the sum is 39.

The square root of 856904241 is about 29272.9267583547. The cubic root of 856904241 is about 949.8260959608.

The spelling of 856904241 in words is "eight hundred fifty-six million, nine hundred four thousand, two hundred forty-one".