810813942 has 48 divisors (see below), whose sum is σ = 1901677680. Its totient is φ = 256040352.

The previous prime is 810813911. The next prime is 810814001. The reversal of 810813942 is 249318018.

It is a junction number, because it is equal to n+sod(n) for n = 810813897 and 810813906.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 1303 + ... + 40290.

It is an arithmetic number, because the mean of its divisors is an integer number (39618285).

Almost surely, 2^810813942 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 810813942, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (950838840).

810813942 is an abundant number, since it is smaller than the sum of its proper divisors (1090863738).

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

810813942 is a wasteful number, since it uses less digits than its factorization.

810813942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41642 (or 41617 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 810813942 is about 28474.7948543971. The cubic root of 810813942 is about 932.4818826966.

The spelling of 810813942 in words is "eight hundred ten million, eight hundred thirteen thousand, nine hundred forty-two".