813844842 has 16 divisors (see below), whose sum is σ = 1723436352. Its totient is φ = 255323840.

The previous prime is 813844831. The next prime is 813844847. The reversal of 813844842 is 248448318.

It is a junction number, because it is equal to n+sod(n) for n = 813844794 and 813844803.

It is not an unprimeable number, because it can be changed into a prime (813844847) 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, 3989334 + ... + 3989537.

It is an arithmetic number, because the mean of its divisors is an integer number (107714772).

Almost surely, 2^813844842 is an apocalyptic number.

813844842 is an abundant number, since it is smaller than the sum of its proper divisors (909591510).

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

813844842 is a wasteful number, since it uses less digits than its factorization.

813844842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7978893.

The product of its digits is 196608, while the sum is 42.

The square root of 813844842 is about 28527.9659632439. The cubic root of 813844842 is about 933.6423400585.

The spelling of 813844842 in words is "eight hundred thirteen million, eight hundred forty-four thousand, eight hundred forty-two".