3785813811 has 24 divisors (see below), whose sum is σ = 5913523616. Its totient is φ = 2320047360.

The previous prime is 3785813789. The next prime is 3785813819. The reversal of 3785813811 is 1183185873.

3785813811 is a `hidden beast` number, since 37 + 8 + 581 + 38 + 1 + 1 = 666.

It is not a de Polignac number, because 3785813811 - 2⁷ = 3785813683 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3785813819) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 38935 + ... + 95328.

Almost surely, 2^3785813811 is an apocalyptic number.

3785813811 is a deficient number, since it is larger than the sum of its proper divisors (2127709805).

3785813811 is a wasteful number, since it uses less digits than its factorization.

3785813811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134523 (or 134520 counting only the distinct ones).

The product of its digits is 161280, while the sum is 45.

The square root of 3785813811 is about 61528.9672512062. The cubic root of 3785813811 is about 1558.5464505450.

The spelling of 3785813811 in words is "three billion, seven hundred eighty-five million, eight hundred thirteen thousand, eight hundred eleven".