812656842 has 16 divisors (see below), whose sum is σ = 1628439552. Its totient is φ = 270364640.

The previous prime is 812656813. The next prime is 812656843. The reversal of 812656842 is 248656218.

It is a super-2 number, since 2×812656842² = 1320822285698825928, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 812656794 and 812656803.

It is not an unprimeable number, because it can be changed into a prime (812656843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126858 + ... + 133109.

It is an arithmetic number, because the mean of its divisors is an integer number (101777472).

Almost surely, 2^812656842 is an apocalyptic number.

812656842 is an abundant number, since it is smaller than the sum of its proper divisors (815782710).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

812656842 is a wasteful number, since it uses less digits than its factorization.

812656842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260493.

The product of its digits is 184320, while the sum is 42.

The square root of 812656842 is about 28507.1366853986. The cubic root of 812656842 is about 933.1878278556.

The spelling of 812656842 in words is "eight hundred twelve million, six hundred fifty-six thousand, eight hundred forty-two".