3821821823 has 4 divisors (see below), whose sum is σ = 4022970360. Its totient is φ = 3620673288.

The previous prime is 3821821807. The next prime is 3821821849. The reversal of 3821821823 is 3281281283.

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

It is not a de Polignac number, because 3821821823 - 2⁴ = 3821821807 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3821811823) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100574240 + ... + 100574277.

It is an arithmetic number, because the mean of its divisors is an integer number (1005742590).

Almost surely, 2^3821821823 is an apocalyptic number.

3821821823 is a deficient number, since it is larger than the sum of its proper divisors (201148537).

3821821823 is a wasteful number, since it uses less digits than its factorization.

3821821823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201148536.

The product of its digits is 36864, while the sum is 38.

The square root of 3821821823 is about 61820.8850066060. The cubic root of 3821821823 is about 1563.4721346122.

The spelling of 3821821823 in words is "three billion, eight hundred twenty-one million, eight hundred twenty-one thousand, eight hundred twenty-three".