3940828021 has 48 divisors (see below), whose sum is σ = 4648492800. Its totient is φ = 3326828544.

The previous prime is 3940828013. The next prime is 3940828033. The reversal of 3940828021 is 1208280493.

It is not a de Polignac number, because 3940828021 - 2³ = 3940828013 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 (3940828081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 22015710 + ... + 22015888.

It is an arithmetic number, because the mean of its divisors is an integer number (96843600).

Almost surely, 2^3940828021 is an apocalyptic number.

It is an amenable number.

3940828021 is a deficient number, since it is larger than the sum of its proper divisors (707664779).

3940828021 is a wasteful number, since it uses less digits than its factorization.

3940828021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398 (or 385 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 3940828021 is about 62776.0146951047. The cubic root of 3940828021 is about 1579.5346625415.

The spelling of 3940828021 in words is "three billion, nine hundred forty million, eight hundred twenty-eight thousand, twenty-one".