856419793 has 4 divisors (see below), whose sum is σ = 885951540. Its totient is φ = 826888048.

The previous prime is 856419757. The next prime is 856419799. The reversal of 856419793 is 397914658.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 397914658 = 2 ⋅198957329.

It can be written as a sum of positive squares in 2 ways, for example, as 357701569 + 498718224 = 18913^2 + 22332^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-856419793 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 856419793.

It is not an unprimeable number, because it can be changed into a prime (856419799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14765830 + ... + 14765887.

It is an arithmetic number, because the mean of its divisors is an integer number (221487885).

Almost surely, 2^856419793 is an apocalyptic number.

It is an amenable number.

856419793 is a deficient number, since it is larger than the sum of its proper divisors (29531747).

856419793 is a wasteful number, since it uses less digits than its factorization.

856419793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29531746.

The product of its digits is 1632960, while the sum is 52.

The square root of 856419793 is about 29264.6509119791. The cubic root of 856419793 is about 949.6470685304.

The spelling of 856419793 in words is "eight hundred fifty-six million, four hundred nineteen thousand, seven hundred ninety-three".