856520434 has 16 divisors (see below), whose sum is σ = 1601804736. Its totient is φ = 333709200.

The previous prime is 856520419. The next prime is 856520447. The reversal of 856520434 is 434025658.

It is a junction number, because it is equal to n+sod(n) for n = 856520393 and 856520402.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2780757 + ... + 2781064.

It is an arithmetic number, because the mean of its divisors is an integer number (100112796).

Almost surely, 2^856520434 is an apocalyptic number.

856520434 is a deficient number, since it is larger than the sum of its proper divisors (745284302).

856520434 is a wasteful number, since it uses less digits than its factorization.

856520434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5561841.

The product of its (nonzero) digits is 115200, while the sum is 37.

The square root of 856520434 is about 29266.3703591682. The cubic root of 856520434 is about 949.6842658987.

The spelling of 856520434 in words is "eight hundred fifty-six million, five hundred twenty thousand, four hundred thirty-four".