819855126 has 12 divisors (see below), whose sum is σ = 1776352812. Its totient is φ = 273285036.

The previous prime is 819855103. The next prime is 819855137. The reversal of 819855126 is 621558918.

It is a happy number.

819855126 is a `hidden beast` number, since 8 + 1 + 98 + 551 + 2 + 6 = 666.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22773736 + ... + 22773771.

It is an arithmetic number, because the mean of its divisors is an integer number (148029401).

Almost surely, 2^819855126 is an apocalyptic number.

819855126 is an abundant number, since it is smaller than the sum of its proper divisors (956497686).

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

819855126 is a wasteful number, since it uses less digits than its factorization.

819855126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45547515 (or 45547512 counting only the distinct ones).

The product of its digits is 172800, while the sum is 45.

The square root of 819855126 is about 28633.1124050460. The cubic root of 819855126 is about 935.9350368567.

The spelling of 819855126 in words is "eight hundred nineteen million, eight hundred fifty-five thousand, one hundred twenty-six".