4003821820 has 12 divisors (see below), whose sum is σ = 8408025864. Its totient is φ = 1601528720.

The previous prime is 4003821781. The next prime is 4003821821. The reversal of 4003821820 is 281283004.

It is a super-2 number, since 2×4003821820² = 32061178332616224800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4003821821) 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, 100095526 + ... + 100095565.

It is an arithmetic number, because the mean of its divisors is an integer number (700668822).

Almost surely, 2^4003821820 is an apocalyptic number.

It is an amenable number.

4003821820 is an abundant number, since it is smaller than the sum of its proper divisors (4404204044).

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

4003821820 is a wasteful number, since it uses less digits than its factorization.

4003821820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200191100 (or 200191098 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 4003821820 is about 63275.7601297685. The cubic root of 4003821820 is about 1587.9064544633.

The spelling of 4003821820 in words is "four billion, three million, eight hundred twenty-one thousand, eight hundred twenty".