3820813505 has 4 divisors (see below), whose sum is σ = 4584976212. Its totient is φ = 3056650800.

The previous prime is 3820813501. The next prime is 3820813523. The reversal of 3820813505 is 5053180283.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1944104464 + 1876709041 = 44092^2 + 43321^2 .

It is not a de Polignac number, because 3820813505 - 2² = 3820813501 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3820813501) 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 3 ways as a sum of consecutive naturals, for example, 382081346 + ... + 382081355.

It is an arithmetic number, because the mean of its divisors is an integer number (1146244053).

Almost surely, 2^3820813505 is an apocalyptic number.

It is an amenable number.

3820813505 is a deficient number, since it is larger than the sum of its proper divisors (764162707).

3820813505 is an equidigital number, since it uses as much as digits as its factorization.

3820813505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 764162706.

The product of its (nonzero) digits is 28800, while the sum is 35.

The square root of 3820813505 is about 61812.7293120115. The cubic root of 3820813505 is about 1563.3346246470.

Adding to 3820813505 its reverse (5053180283), we get a palindrome (8873993788).

The spelling of 3820813505 in words is "three billion, eight hundred twenty million, eight hundred thirteen thousand, five hundred five".