1811806136 has 64 divisors (see below), whose sum is σ = 3924910080. Its totient is φ = 768049920.

The previous prime is 1811806133. The next prime is 1811806151. The reversal of 1811806136 is 6316081181.

It is a junction number, because it is equal to n+sod(n) for n = 1811806096 and 1811806105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1811806133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2491805 + ... + 2492531.

It is an arithmetic number, because the mean of its divisors is an integer number (61326720).

Almost surely, 2^1811806136 is an apocalyptic number.

It is an amenable number.

1811806136 is an abundant number, since it is smaller than the sum of its proper divisors (2113103944).

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

1811806136 is a wasteful number, since it uses less digits than its factorization.

1811806136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1164 (or 1160 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 35.

The square root of 1811806136 is about 42565.3161153538. The cubic root of 1811806136 is about 1219.0941353985.

The spelling of 1811806136 in words is "one billion, eight hundred eleven million, eight hundred six thousand, one hundred thirty-six".