1834686989820 has 144 divisors (see below), whose sum is σ = 5740592326560. Its totient is φ = 473947780608.

The previous prime is 1834686989809. The next prime is 1834686989827. The reversal of 1834686989820 is 289896864381.

1834686989820 is a `hidden beast` number, since 1 + 8 + 3 + 468 + 6 + 9 + 89 + 82 + 0 = 666.

It is a super-2 number, since 2×1834686989820² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1834686989827) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 923659 + ... + 2126621.

It is an arithmetic number, because the mean of its divisors is an integer number (39865224490).

Almost surely, 2^{1834686989820} is an apocalyptic number.

1834686989820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1834686989820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2870296163280).

1834686989820 is an abundant number, since it is smaller than the sum of its proper divisors (3905905336740).

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

1834686989820 is a wasteful number, since it uses less digits than its factorization.

1834686989820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1203244 (or 1203239 counting only the distinct ones).

The product of its (nonzero) digits is 286654464, while the sum is 72.

The spelling of 1834686989820 in words is "one trillion, eight hundred thirty-four billion, six hundred eighty-six million, nine hundred eighty-nine thousand, eight hundred twenty".